125% is the change from 4 to 9
Calculation steps:
[( 9 - 4 ) ÷ 4] x 100 = 125%
Formula
Percentage change = [(9 - 4) / 4] x 100
Subtract the new number by the original number
9 - 4 = 5
5 ÷ 4 = 1.25
1.25 x 100 = 125%
Example