Question: Pablo Picasso's La Gommeuse was auctioned at Sotheby's as part of the collection of a businessman estimated to have a net worth of how much?

<P0-S0> William Ingraham Koch ( ; born May 3, 1940) is an American businessman, sailor, and collector. <P0-S1>  His boat was the winner of the America's Cup in 1992. " <P0-S2> Forbes" estimated Koch's net worth at $4 billion in 2012 from oil and other investments. <SEP> <P1-S0> La Gommeuse is a 1901 oil on canvas painting by the Spanish artist Pablo Picasso. <P1-S1>  It dates from his so-called Blue period and is noted for its caricature of Picasso's friend Pere Mañach painted on the reverse. <P1-S2>  It was offered for sale "ex" the William I. Koch collection at a Sotheby's, New York, auction on 5 November 2015. <P1-S3>  The painting realized $67.5 million at the sale, a record for a Blue period Picasso and placing the painting among the most expensive ever sold. <SEP> <P2-S0> Dimitri Mavrommatis is a Greek born asset manager and art collector based in Switzerland with additional residences in Paris, London and New York City. <P2-S1>  He was on the European advisory board of Christie's and the international advisory board of Sotheby's. <P2-S2>  In 2014 Sotheby's Geneva featured Mavrommatis' gems in their November jewelry sale in an event the auction house titled "The Passion of Collecting". <P2-S3>  In 2012 ARTnews editor Milton Esterow listed Mavrommatis in the magazine's yearly top ten list of the worlds' 200 premiere art collectors. <P2-S4>  In addition to possessing a sizable collection of contemporary art including significant pieces by Pablo Picasso, Joan Miro, Alexander Calder, Andy Warhol and Christopher Wool, Mavrommatis owns one of the most important collections of Sèvres porcelain on the planet.He also sold at Sotheby's one of the most important jewelry collections in the world with two new records for a sapphire and a ruby. <SEP> <P3-S0> Asset poverty is an economic and social condition that is more persistent and prevalent than income poverty. <P3-S1>  It can be defined as a household’s inability to access wealth resources that are sufficient to provide for basic needs for a period of three months. <P3-S2>  Basic needs refer to the minimum standards for consumption and acceptable needs. <P3-S3>  Wealth resources consist of home ownership, other real estate (second home, rented properties, etc.), net value of farm and business assets, stocks, checking and savings accounts, and other savings (money in savings bonds, life insurance policy cash values, etc.). <P3-S4>  Wealth is measured in three forms: net worth, net worth minus home equity, and liquid assets. <P3-S5>  Net worth consists of all the aspects mentioned above. <P3-S6>  Net worth minus home equity is the same except it does not include home ownership in asset calculations. <P3-S7>  Liquid assets are resources that are readily available such as cash, checking and savings accounts, stocks, and other sources of savings. <P3-S8>  There are two types of assets: tangible and intangible. <P3-S9>  Tangible assets most closely resemble liquid assets in that they include stocks, bonds, property, natural resources, and hard assets not in the form of real estate. <P3-S10>  Intangible assets are simply the access to credit, social capital, cultural capital, political capital, and human capital.