70% is the change from 420 to 714
Calculation steps:
[( 714 - 420 ) ÷ 420] x 100 = 70%
Formula
Percentage change = [(714 - 420) / 420] x 100
Subtract the new number by the original number
714 - 420 = 294
294 ÷ 420 = 0.7
0.7 x 100 = 70%
Example