Question

Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.
72 is what percent of 480? Write and solve an equation to solve the problem.

Note: Enter your answer and show all the steps that you use to solve this problem in the space provided.
Explain how mental math can be used to estimate a 15% tip on a taxi ride that costs $23.25. Find the tip using that method.

Answer 1

x% of 480 = 72
x/100 * 480 = 72
480x = 7200
x = 15

so 15% of 480 = 72

check by taking 15% of 480

to take 15 of something, I take 10%, (just shift the decimal one place), then take half of that

e.g. 10% of $23.25 = 2.35
half of that is appr 1.20 , so tip is appr 3.50
actual 15% = 3.49