64.29% is the change from 420 to 690
Calculation steps:
[( 690 - 420 ) ÷ 420] x 100 = 64.29%
Formula
Percentage change = [(690 - 420) / 420] x 100
Subtract the new number by the original number
690 - 420 = 270
270 ÷ 420 = 0.6428571428571429
0.6428571428571429 x 100 = 64.29%