Bev went to lunch with some friends. The bill, including tax, was $20. Bev left a tip of $5.

What percent of the bill did Bev leave as tip?

In order to find the percent tip, you divide the amount left by the total amount of the bill:

$5 tip/$20 bill = 0.25

In order to change this into a percent, you need to multiply this 0.25 by 100, so the percent tip left is 25% of the bill