15.31% is the change from 640 to 738
Calculation steps:
[( 738 - 640 ) ÷ 640] x 100 = 15.31%
Formula
Percentage change = [(738 - 640) / 640] x 100
Subtract the new number by the original number
738 - 640 = 98
98 ÷ 640 = 0.153125
0.153125 x 100 = 15.31%