20.12% is the change from 641 to 770
Calculation steps:
[( 770 - 641 ) ÷ 641] x 100 = 20.12%
Formula
Percentage change = [(770 - 641) / 641] x 100
Subtract the new number by the original number
770 - 641 = 129
129 ÷ 641 = 0.20124804992199688
0.20124804992199688 x 100 = 20.12%