He bought 3*20=$<<3*20=60>>60 of books a month

That means he bought 60*12=$<<60*12=720>>720 of books a year

So he lost 720-500=$<<720-500=220>>220

# Answer

220
Question:
Jack bought 3 books a month at $20 each.  He sells them back at the end of the year for $500.  How much money did he lose?
Answer:
Let's think step by step.

user
220
Jack bought 3 books a month at $20 each.  He sells them back at the end of the year for $500.  How much money did he lose?
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