42.81% is the change from 640 to 914
Calculation steps:
[( 914 - 640 ) ÷ 640] x 100 = 42.81%
Formula
Percentage change = [(914 - 640) / 640] x 100
Subtract the new number by the original number
914 - 640 = 274
274 ÷ 640 = 0.428125
0.428125 x 100 = 42.81%