Avril Lavigne 90 million let s say 80 as Billboard says in case you don t like I calculated ALL the sales of Avril Lavigne as listed with SOURCES in her wikipedia album pages And Billboard says 30 hell yeah but nikkansports says 40 million Because Let Go 20 m Under My Skin 12 m The Best Damn Thing 8 m Goodbye Lullaby 2 m Avril Lavigne 650 000 42 650 000 Which all of them are sourced in her discography page Which makes it 90 m Claimed 40 m albums 50 m singles 90 m What is wrong with wikipedia by the way Drat All pages says different things even if they have a SOURCE People hint undo pitilessly I m not saying you or everyone do that way but please check her pages