-15.79% is the change from 760 to 640
Calculation steps:
[( 640 - 760 ) ÷ 760] x 100 = -15.79%
Formula
Percentage change = [(640 - 760) / 760] x 100
Subtract the new number by the original number
640 - 760 = -120
-120 ÷ 760 = -0.15789473684210525
-0.15789473684210525 x 100 = -15.79%