76.19% is the change from 420 to 740
Calculation steps:
[( 740 - 420 ) ÷ 420] x 100 = 76.19%
Formula
Percentage change = [(740 - 420) / 420] x 100
Subtract the new number by the original number
740 - 420 = 320
320 ÷ 420 = 0.7619047619047619
0.7619047619047619 x 100 = 76.19%