24.06% is the change from 640 to 794
Calculation steps:
[( 794 - 640 ) ÷ 640] x 100 = 24.06%
Formula
Percentage change = [(794 - 640) / 640] x 100
Subtract the new number by the original number
794 - 640 = 154
154 ÷ 640 = 0.240625
0.240625 x 100 = 24.06%