31.83% is the change from 421 to 555
Calculation steps:
[( 555 - 421 ) ÷ 421] x 100 = 31.83%
Formula
Percentage change = [(555 - 421) / 421] x 100
Subtract the new number by the original number
555 - 421 = 134
134 ÷ 421 = 0.3182897862232779
0.3182897862232779 x 100 = 31.83%