71.43% is the change from 420 to 720
Calculation steps:
[( 720 - 420 ) ÷ 420] x 100 = 71.43%
Formula
Percentage change = [(720 - 420) / 420] x 100
Subtract the new number by the original number
720 - 420 = 300
300 ÷ 420 = 0.7142857142857143
0.7142857142857143 x 100 = 71.43%