a

%

increase of

is

a

%

decrease of

is

- F
Formula

For example, a A percent increase of R is B A = 20, R = Result (the original number that mean R is 100%), B = 50 Formula for decrease percentage: B / [(100% - A%) / 100] Formula for increase percentage: B / [(100% + A%) / 100] 50 / [(100% + 20%) / 100]

- 1
100% + A%

100% + A% = 100% + 20% = 120% 120% to decimal = 120 / 100 = 1.2

- 2
B / Decimal number of step one

B / 1.2 = 50 / 1.2 = 41.67 So 20% of 41.67 is 50 In the decrease percentage calculator, the formula will be the same but the percentage number should be negative