32.3% is the change from 421 to 557
Calculation steps:
[( 557 - 421 ) ÷ 421] x 100 = 32.3%
Formula
Percentage change = [(557 - 421) / 421] x 100
Subtract the new number by the original number
557 - 421 = 136
136 ÷ 421 = 0.32304038004750596
0.32304038004750596 x 100 = 32.3%