Question

Dominic has $15 for dinner. His meal costs $13.90. He wants to leave an 18% tip. Does he have enough money? Explain your reasoning

Answer 1

This question could be paraphrased:  Is $13.90 plus an 18% tip still less than $15?

Is $13.90 + 0.18($13.90) less than $15?

That comes to $16.40.    No, Dom doesn't have enough money.


How much could he afford to spend on a meal if there were still to be an 18% tip?

1.18x = $15, or    x = $15/1.18 = $12.71.

Answer 2

If you plug into a calculator, you can see that the total comes up to over $15. He is $1 short.

To get your answer, you can either just plug it into the calculator. Or, you can do so by the following process:

13.90 (total of meal) x .15 (percentage of a tip he wants to leave= 2.085

Add the total to 13.90, and that gives you about $15.99 which is about $1 more than what he has.