46.09% is the change from 640 to 935
Calculation steps:
[( 935 - 640 ) ÷ 640] x 100 = 46.09%
Formula
Percentage change = [(935 - 640) / 640] x 100
Subtract the new number by the original number
935 - 640 = 295
295 ÷ 640 = 0.4609375
0.4609375 x 100 = 46.09%