Question

Peter used a $5 gift certificate to help pay for his lunch after adding a 15% tip to the cost of his meal Peter still had to pay $2.36 in cash how much did Peter's meal cost

Answer 1

So, because he used a five dollar certificate, the total price of his meal was 7.36. Now we need to find the price of his food. Because he gave the waiters a fifteen percent tip, his meal is 85% of the total cost:
0.85(7.36) = 6.256
We can round up:
PETER SPENT $6.26 ON HIS MEAL