Question: How many copies of the books by the author of The Leopard have sold worldwide?
Context: Thomas King Forçade (September 11, 1945 – November 17, 1978), a.k.a. Gary Goodson, was an American underground journalist and cannabis rights activist in the 1970s.  For many years he ran the Underground Press Syndicate (later called the Alternative Press Syndicate), and was the founder in summer 1974 of "High Times" magazine.  "High Times" ran articles calling marijuana a "medical wonder drug" and ridiculing the US Drug Enforcement Administration.  "High Times" became a huge success with a circulation of more than 500,000 copies a month and revenues approaching $10 million by 1977 and embraced by the young adult market as the bible of the alternative life culture.  By 1977 "High Times" was selling as many copies an issue as" Rolling Stone "and "National Lampoon.  "Forcade published several other publications such as" Stoned, National Weed, Dealer" and others that always were laced with some of the best humor, pop culture and a forum for some of the best writers, artists and political savvy mostly veiled as the counter culture entertainment magazine.  Many of the writers went on to be published in premiere papers and magazines in North America. Jo Nesbø (] ; born 29 March 1960) is a Norwegian writer, musician, former economist and reporter.  As of March 2014 more than 3 million copies of his novels have been sold in Norway, and his work has been translated into over 40 languages, selling 30 million copies worldwide.  Nesbø is primarily known for his crime novels about Inspector Harry Hole, but he is also the main vocalist and songwriter for the Norwegian rock band Di Derre.  In 2007 Nesbø also released his first children's book, "Doktor Proktors Prompepulver" (English translation: "Doctor Proctor's Fart Powder").  The 2011 film "Headhunters" is based on Nesbø's novel "Hodejegerne (The Headhunters)". Think and Grow Rich was written in 1937 by Napoleon Hill, promoted as a personal development and self-improvement book.  Hill writes that he was inspired by a suggestion from business magnate and later-philanthropist Andrew Carnegie.  While the book's title and much of the text concerns increased income, the author insists that the philosophy taught in the book can help people succeed in any line of work, to do and be anything they can imagine.  First published during the Great Depression, at the time of Hill's death in 1970, "Think and Grow Rich" had sold more than 20 million copies, and by 2015 over 100 million copies had been sold worldwide.  It remains the biggest seller of Napoleon Hill's books. " BusinessWeek" magazine's Best-Seller List ranked it the sixth best-selling paperback business book 70 years after it was published.  "Think and Grow Rich" is listed in John C. Maxwell's "A Lifetime "Must Read" Books List." Canadian singer Nelly Furtado has released six studio albums, twenty singles, one video album, one live album, two compilation albums, three extended plays, and twenty-three music videos.  Furtado released her debut album "Whoa, Nelly! " in 2000 and it became a commercial success selling 9 million copies worldwide.  It has been certified multi Platinum in countries such as Canada, United States, Australia and New Zealand.  The album spawned four singles including the successful top 10 hits; "I'm Like a Bird" and "Turn Off the Light".  In 2003 she released her second album "Folklore", while the album did not match the success of her previous album in such markets as the US and Australia, it did however become a success in several European countries.  "Folklore" has sold 3 million copies worldwide.  The album produced two European top 10 hits; "Powerless (Say What You Want)" and "Força", while "Try" peaked inside the top 10 in Canada.  Furtado's third album "Loose" (2006) became her best selling album of career with 12 million copies sold worldwide.  It also reached number one on the album chart of nine countries and was certified multi Platinum in several countries such as Canada, UK, Australia, Germany, Switzerland, Austria and New Zeeland.  The album spawned four successful number one singles; "Promiscuous", "Maneater", "Say It Right" and "All Good Things (Come to an End)".  "Loose" was one of the best selling albums of 2006–2007 and is twenty-second best-selling album of the 2000s.  She released her first Spanish language album "Mi Plan" in 2009 which became a success in Europe and on the Latin charts.  The lead single "Manos al Aire" became a European top 10 hit and also topped the "Billboard" Hot Latin Songs chart, making Furtado the first North American singer to reach number one on that chart with an original Spanish song.  "Mi Plan" has been certified Platinum (Latin) in the US.  In 2010 she released a remix album "Mi Plan Remixes" and her first greatest hits "The Best of Nelly Furtado".  Furtado released her fifth album "The Spirit Indestructible" in 2012, followed by "The Ride" in 2017. Sega All Stars was Sega's budget series for the Dreamcast, similar to Platinum Hits, Greatest Hits, and Player's Choice, for games that have sold many copies.  When a title became a Sega All Stars title, it was sold at a lower price ($19.95) and given reprinted labeling.  Sega All Stars was exclusive to North America, game covers were given an orange bar (as opposed to Europe's blue color scheme) with the brand name written from top to bottom.  The disc labels were also changed to include a small circle and the Sega All Stars brand printed inside of it.  17 titles were made into Sega All Stars titles.  Also, in printing, original releases said "Sega Dreamcast" on the disc but the All-stars versions just simply said "Dreamcast" to match up games released with the black label like "D2", "Jet Set Radio", "Sega GT", and "Sonic Adventure 2".  Original Dreamcast games were released in the white labels and said "Sega Dreamcast" on the inlay like the Sega All-stars labels. The Burning Red is the third album by the American groove metal band Machine Head.  It is the band's second best selling album in the US, selling as many copies in three years as "Burn My Eyes" sold in almost eight years (1994–2002) .  The album has sold over 134,000 copies in the US and it was certified silver in 2011 by the BPI for sales of 60,000 in the UK. From Unknown Worlds is an anthology of fantasy fiction short stories edited by John W. Campbell, Jr. and illustrated by Edd Cartier, the first of a number of anthologies drawing their contents from the classic magazine "Unknown" of the 1930s-40s.  It was first published in magazine format by American company Street & Smith in 1948; the publication was an attempt to determine if there was a market for a revived "Unknown".  Street & Smith printed 300,000 copies, against the advice of John Campbell, but although it sold better than the original, too many copies were returned for the publisher to be willing to revive the magazine.  The first British edition was issued by Atlas Publishing in 1952; part of the run was issued in a hardcover binding.  This edition omitted the story "One Man's Harp." . The Leopard is a crime novel by Norwegian novelist, Jo Nesbø.  Its Norwegian title is "Panserhjerte", which does not directly translate to The Leopard; it rather means something along the lines of "armoured heart".  Moreover, "leopard" refers to the stealthy tread of the killer in the book, while "armoured heart" is what Harry Hole himself gains by his experiences.  "Panserhjerte" is also a Norwegian term for Constrictive pericarditis.  "The Leopard" is the eighth novel featuring Nesbø's crime detective, Inspector Harry Hole. The cosmological interpretation of quantum mechanics, proposed by Anthony Aguirre and Max Tegmark, is an interpretation of quantum mechanics that applies in the context of eternal cosmological inflation, which arguably predicts an infinite three-dimensional space with infinitely many planets and infinitely many copies of any quantum system.  According to this interpretation, the wavefunction for a quantum system describes not some imaginary ensemble of possibilities for what the system might be doing, but rather the actual spatial collection of identical copies of the system that exist in our infinite space.  Its collapse can be avoided.  Moreover, the quantum uncertainty that you experience simply reflects your inability to self-locate in space, i.e., to know which of your infinitely many copies throughout space is the one having your subjective perceptions. Suanfa tongzong (General Source of Computational Methods) is a mathematical text written by sixteenth century Chinese mathematician Cheng Dawei (1533–1606) and published in the year 1592.  The book contains 595 problems divided into 17 chapters.  The book is essentially general arithmetic for the abacus.  The book was the main source available to scholars concerning mathematics as it developed in China’s tradition.  Six years after the publication of Suanfa Tongzong, Cheng Dawei published another book titled "Suanfa Zuanyao" ("A Compendium of calculating Methods").  About 90% of the content of the new book came from the contents of four chapters of the first book with some rearrangement.  It is said that when Suanfa Tongzong was first published, it sold so many copies that the cost of paper went up and the lucrative sales resulted in unscrupulous people beginning to print pirated copies of the book with many errors.  it was this that forced the author to print an abridged version.
Answer: 30 million