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