13.57% is the change from 420 to 477
Calculation steps:
[( 477 - 420 ) ÷ 420] x 100 = 13.57%
Formula
Percentage change = [(477 - 420) / 420] x 100
Subtract the new number by the original number
477 - 420 = 57
57 ÷ 420 = 0.1357142857142857
0.1357142857142857 x 100 = 13.57%