125% is the change from 320 to 720
Calculation steps:
[( 720 - 320 ) ÷ 320] x 100 = 125%
Formula
Percentage change = [(720 - 320) / 320] x 100
Subtract the new number by the original number
720 - 320 = 400
400 ÷ 320 = 1.25
1.25 x 100 = 125%
Example