18.28% is the change from 640 to 757
Calculation steps:
[( 757 - 640 ) ÷ 640] x 100 = 18.28%
Formula
Percentage change = [(757 - 640) / 640] x 100
Subtract the new number by the original number
757 - 640 = 117
117 ÷ 640 = 0.1828125
0.1828125 x 100 = 18.28%