conversations.from: human
conversations.value: Sam is stocking up on canned tuna. He got 9 cans at the supermarket, and had 5 coupons for 25 cents off a single can per coupon. He paid $20 and got $5.50 in change. How many cents does a can of tuna cost?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: His total without the coupons was $20 - $5.50 = $14.50
  He had 5 coupons that each saved him 25 cents, so the full price of all the tuna is $14.50 + 5*$0.25 =$15.75.
  He bought 9 cans of tuna, so each can costs $15.75 / 9 = $1.75
  As 1 dollar has 100 cents 1.75 * 100 = 175 cents