10.78% is the change from 640 to 709
Calculation steps:
[( 709 - 640 ) ÷ 640] x 100 = 10.78%
Formula
Percentage change = [(709 - 640) / 640] x 100
Subtract the new number by the original number
709 - 640 = 69
69 ÷ 640 = 0.1078125
0.1078125 x 100 = 10.78%