Patty ordered a pizza to be delivered. The bill was 12.00. Patty pays 15 and tells the delivery person to keep the change as a tip. What percent tip did she give?
Nevermind, it's 25%, 100/12*15=125-100=25%
The amount of dollars Patty paid extra is 15 - 12 = 3.
So 3 dollars is the tip Patty paid.
Now we need to what percentage of 12 is 3.
3/12 = 0.25
So the answer you are looking for is 25 percent.