Having a tough time remembering how to find the percentage of a number? Try turning the question word-for-word into an equation.
For what, substitute the letter x; for is, substitute an equal sign; for of, substitute a multiplication sign. Change percents to decimals or fractions, whichever you find easier. Then solve the equation.
Example: 18 is what percent of 90?
18 = x(90)
18/90 = x
1/5 = x
20% = x
Example: What is 15% of 60?
x = .15(60) = 9
or
x = 15/100 x 60 = 900/100 = 9
