30.88% is the change from 421 to 551
Calculation steps:
[( 551 - 421 ) ÷ 421] x 100 = 30.88%
Formula
Percentage change = [(551 - 421) / 421] x 100
Subtract the new number by the original number
551 - 421 = 130
130 ÷ 421 = 0.3087885985748218
0.3087885985748218 x 100 = 30.88%