To subtract any percentage from a number, simply multiply that number by the percentage you want to remain.
In other words, multiply by 100 percent minus the percentage you want to subtract, in decimal form.
To subtract 20 percent, multiply by 80 percent (0.8).
How do you calculate 20 percent?
First, convert the percentage discount to a decimal. A 20 percent discount is 0.20 in decimal format. Secondly, multiply the decimal discount by the price of the item to determine the savings in dollars. For example, if the original price of the item equals $24, you would multiply 0.2 by $24 to get $4.80.
How do you work percentages out on a calculator?
If your calculator has a percentage button, the calculation is as follows: 40 x 25% = 10. If your calculator does not have a percentage button, you must first divide the percentage by 100: 25 ÷ 100 = 0.25. You can then multiply this answer by the whole to determine the part: 0.25 x 40 = 10.
How do you calculate a percentage?
You divide your percentage by 100. So, 40% would be 40 divided by 100 or .40. Once you have the decimal version of your percentage, simply multiply it by the given number. In this case, the amount of your paycheck.