31.9% is the change from 420 to 554
Calculation steps:
[( 554 - 420 ) ÷ 420] x 100 = 31.9%
Formula
Percentage change = [(554 - 420) / 420] x 100
Subtract the new number by the original number
554 - 420 = 134
134 ÷ 420 = 0.319047619047619
0.319047619047619 x 100 = 31.9%