69.05% is the change from 420 to 710
Calculation steps:
[( 710 - 420 ) ÷ 420] x 100 = 69.05%
Formula
Percentage change = [(710 - 420) / 420] x 100
Subtract the new number by the original number
710 - 420 = 290
290 ÷ 420 = 0.6904761904761905
0.6904761904761905 x 100 = 69.05%