-15.79% is the change from 855 to 720
Calculation steps:
[( 720 - 855 ) ÷ 855] x 100 = -15.79%
Formula
Percentage change = [(720 - 855) / 855] x 100
Subtract the new number by the original number
720 - 855 = -135
-135 ÷ 855 = -0.15789473684210525
-0.15789473684210525 x 100 = -15.79%