21.26% is the change from 635 to 770
Calculation steps:
[( 770 - 635 ) ÷ 635] x 100 = 21.26%
Formula
Percentage change = [(770 - 635) / 635] x 100
Subtract the new number by the original number
770 - 635 = 135
135 ÷ 635 = 0.2125984251968504
0.2125984251968504 x 100 = 21.26%