To find a percentage of a whole, multiply the percent (written as a decimal) by the whole. Remember, to convert a percent to a decimal, divide by 100.

percent (as decimal) × whole = part (of whole)

To find the percentage of a whole, given the whole and the part, or, to find the whole, given the part and the percent, rearrange the equation.

whole = part ÷ percent (as decimal)

percent (as decimal) = part ÷ whole