Question

You tell your parents that you will pay the 15% tip for dinner. The bill was $130.56. You have $20.
a. Do you have enough to pay the tip?
b. How much should the tip be?

Answer 1

15% of $130.56
"of" in math usually means "times"
15% means 0.15, so calculate
0.15 x 130.56

Answer 2

so I would have enough :)

Answer 3

An easy way to do 15% is:
1) Divide by 10 (shift it a digit)
2) Divide by 2 (half it)
3) Multiply by 3 (triple it)