#### Answer

See below for a sample problem.

#### Work Step by Step

Example percent problem (many others are possible):
Question:
Jill bought shoes on sale (60% off) for $\$30$. How much did the shoes cost originally (before the sale)?
Answer:
We set up a proportion. Since the shoes were $60\%$ off, Jill paid $40\%$ of the original price of the shoes.
$\frac{40}{100}=\frac{30}{x}$
We cross-multiply:
$40x=30*100$
$40x=3000$
$x=3000/40=300/4=150/2=75$
Thus the original price of the shoes was $\$75$.