18.75% is the change from 640 to 760
Calculation steps:
[( 760 - 640 ) ÷ 640] x 100 = 18.75%
Formula
Percentage change = [(760 - 640) / 640] x 100
Subtract the new number by the original number
760 - 640 = 120
120 ÷ 640 = 0.1875
0.1875 x 100 = 18.75%