John goes to a restaurant and has a bill of $32.57. He uses a 10% off coupon on
the cost of the meal. The tax is 8%. He leaves a tip of 18% on the amount before
the coupon or tax is applied. How much does he spend?

John spends $ 37.98

Step-by-step explanation:

1. John has a bill of $ 32.57

2. He leaves a tip of 18% on the amount before  the coupon or tax is applied, in consequence: 32.57 + 18% (32.57) = 32.57 + 5.86 = 38.43

3. He uses a 10% off coupon on  the cost of the meal, therefore:

38.43 - 10% (32.57) = 38.43 - 3.26 = 35.17

4. The tax is 8%, then:

35.17 + 8% (35.17) = 35.17 + 2.81 = 37.98

John spends $ 37.98