Percent Increase
1) Amount of increase/original amount (100%)
2) C = (x2 - x1) / x1 ; Where
C is the relative change
x1 is the initial value
x2 is the final value
Percent of Decrease
1) Amount of decrease / original amount (100%)
2) C = (x2 - x1) / x1 ; Where
C is the relative change
x1 is the initial value
x2 is the final value