His total without the coupons was $20 - $5.50 = $<<20-5.5=14.50>>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 = $<<15.75/9=1.75>>1.75

As 1 dollar has 100 cents 1.75 * 100 = <<1.75*100=175>>175 cents

# Answer

175
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
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?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
175
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?
train