conversations.from: human
conversations.value: Dianne runs a store that sells books.  37% of her 1000 customers end up returning their books.  Her books all cost 15 dollars apiece.  How much money does she keep in sales after subtracting the returns?
  Solve this problem.
conversations.from: assistant
conversations.value: Diane made 1000*15= $15000 in sales because she had 1000 customers each buy a $15 book.
  37% of those customers returned their books, so that means she had .37*1000= 370 returns
  Each of those returns was for a $15 book, so she had 370*15= $5,550 in returns
  For her total leftover income, we subtract the returns from the sales and end up with 15000-5550= $9450 in income.