128.57% is the change from 420 to 960
Calculation steps:
[( 960 - 420 ) ÷ 420] x 100 = 128.57%
Formula
Percentage change = [(960 - 420) / 420] x 100
Subtract the new number by the original number
960 - 420 = 540
540 ÷ 420 = 1.2857142857142858
1.2857142857142858 x 100 = 128.57%