We must multiply the tab by the tip percentage to calculate the tip amount. In this case, we have:

Using a calculator, we can find that the tip amount is $12.36. We need to add the tip amount to the tab to find the total amount that Rebecca should leave. In this case, we have:

Using a calculator, we can find that the total amount is $94.79. Therefore, Rebecca should leave $94.79 if she wants to leave a 15% tip.