17.19% is the change from 640 to 750
Calculation steps:
[( 750 - 640 ) ÷ 640] x 100 = 17.19%
Formula
Percentage change = [(750 - 640) / 640] x 100
Subtract the new number by the original number
750 - 640 = 110
110 ÷ 640 = 0.171875
0.171875 x 100 = 17.19%