45.24% is the change from 420 to 610
Calculation steps:
[( 610 - 420 ) ÷ 420] x 100 = 45.24%
Formula
Percentage change = [(610 - 420) / 420] x 100
Subtract the new number by the original number
610 - 420 = 190
190 ÷ 420 = 0.4523809523809524
0.4523809523809524 x 100 = 45.24%