Wo has sold more albums: Tom Petty or Eminem?

I got into an argument at school about who has sold more albums, cds, records, etc, because I strongly dislike Eminem! So I was wondering, does Tom Petty have him beat?

Thanks!!
Update: To the person who has never heard of Tom Petty, That is pathetic!!!!!!
Update 2: To the person who has never heard of Tom Petty, That is pathetic!!!!!!
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