43.13% is the change from 640 to 916
Calculation steps:
[( 916 - 640 ) ÷ 640] x 100 = 43.13%
Formula
Percentage change = [(916 - 640) / 640] x 100
Subtract the new number by the original number
916 - 640 = 276
276 ÷ 640 = 0.43125
0.43125 x 100 = 43.13%