40.71% is the change from 420 to 591
Calculation steps:
[( 591 - 420 ) ÷ 420] x 100 = 40.71%
Formula
Percentage change = [(591 - 420) / 420] x 100
Subtract the new number by the original number
591 - 420 = 171
171 ÷ 420 = 0.40714285714285714
0.40714285714285714 x 100 = 40.71%