31.35% is the change from 421 to 553
Calculation steps:
[( 553 - 421 ) ÷ 421] x 100 = 31.35%
Formula
Percentage change = [(553 - 421) / 421] x 100
Subtract the new number by the original number
553 - 421 = 132
132 ÷ 421 = 0.31353919239904987
0.31353919239904987 x 100 = 31.35%