Answer:
$37.51
Explanation:
(all percents can be divided by 100 and be turned into decimals)
First, we will read it through and we catch that the tip is before the coupon or tax, so let us find the tip first.
$32.57 x 0.18 = $5.86 (round at hundredths for money)
So, after everything else, we will add on $5.86 for the tip.
Next, let's look at the coupon. He had a 10% coupon, and only paid 90% of the meal: $32.57 x .9 = $29.31
He then pays 108% of $29.31 because of the 8% tax: $29.31 x 1.08 = $31.65
Add on the tip from the start: $31.65 + $5.86 = $37.51
Hope this helps, have a nice day :D