45.37% is the change from 421 to 612
Calculation steps:
[( 612 - 421 ) ÷ 421] x 100 = 45.37%
Formula
Percentage change = [(612 - 421) / 421] x 100
Subtract the new number by the original number
612 - 421 = 191
191 ÷ 421 = 0.45368171021377673
0.45368171021377673 x 100 = 45.37%