63.9% is the change from 421 to 690
Calculation steps:
[( 690 - 421 ) ÷ 421] x 100 = 63.9%
Formula
Percentage change = [(690 - 421) / 421] x 100
Subtract the new number by the original number
690 - 421 = 269
269 ÷ 421 = 0.6389548693586699
0.6389548693586699 x 100 = 63.9%