12.97% is the change from 640 to 723
Calculation steps:
[( 723 - 640 ) ÷ 640] x 100 = 12.97%
Formula
Percentage change = [(723 - 640) / 640] x 100
Subtract the new number by the original number
723 - 640 = 83
83 ÷ 640 = 0.1296875
0.1296875 x 100 = 12.97%