103.57% is the change from 420 to 855
Calculation steps:
[( 855 - 420 ) ÷ 420] x 100 = 103.57%
Formula
Percentage change = [(855 - 420) / 420] x 100
Subtract the new number by the original number
855 - 420 = 435
435 ÷ 420 = 1.0357142857142858
1.0357142857142858 x 100 = 103.57%