Calculate the percentage of something by multiplying the full value by the percentage you want to get. Divide the result by 100. For example, if you want to get 12 percent of 9500, multiply 9500 by 12 and divide the result by 100.
Divide the percentage by 100 and multiply it by the full value. For example, if you want to get 12 percent of 9500, divide 12 by 100, which is .12, and multiply it by 9500.
Add a percentage to the full value by multiplying the full value by 1 plus the percentage fraction. For example, if you want to add 9 percent to 9500, multiply 9500 by 1.09.
Subtract a percentage from the full value by multiplying the full value by 100 minus the percentage you want to subtract. For example, to deduct 9 percent from 9500, multiply 9500 by .91.
Calculate 10 percent by dividing the full value by 10. To get multiples, such as 30, 40 or 60 percent, divide the full value by 10 and multiply the result by 3, 4, 6 and so on.