#### Answer

72

#### Work Step by Step

First change the word problem into an equation.
To change a question into an equation, you:
- Keep percents and numbers
- change the question to the variable $x$
- of means *
Then solve:
2520 is what percent of 3500.
2520 = x% * 3500
2520/3500 = x%
2520/3500 * 100 = x
72 = x