Tai used a coupon and bought a sweater for $32. The full retail price of the sweater was $40. What percent did Tai save with her coupon?

see how you got 80% ... but that was the amount paid ... they paid 80% for it, 20% is the percent that they didnt have to pay since it was on sale. what i would do is:

40-32 = 8.

8/40 = 0.2

20%

it is 8/40 because those are the 8 dollars that you didnt have to pay out of the 40.