25.62% is the change from 640 to 804
Calculation steps:
[( 804 - 640 ) ÷ 640] x 100 = 25.62%
Formula
Percentage change = [(804 - 640) / 640] x 100
Subtract the new number by the original number
804 - 640 = 164
164 ÷ 640 = 0.25625
0.25625 x 100 = 25.62%