14.22% is the change from 640 to 731
Calculation steps:
[( 731 - 640 ) ÷ 640] x 100 = 14.22%
Formula
Percentage change = [(731 - 640) / 640] x 100
Subtract the new number by the original number
731 - 640 = 91
91 ÷ 640 = 0.1421875
0.1421875 x 100 = 14.22%