18.33% is the change from 420 to 497
Calculation steps:
[( 497 - 420 ) ÷ 420] x 100 = 18.33%
Formula
Percentage change = [(497 - 420) / 420] x 100
Subtract the new number by the original number
497 - 420 = 77
77 ÷ 420 = 0.18333333333333332
0.18333333333333332 x 100 = 18.33%