-15.29% is the change from 850 to 720
Calculation steps:
[( 720 - 850 ) ÷ 850] x 100 = -15.29%
Formula
Percentage change = [(720 - 850) / 850] x 100
Subtract the new number by the original number
720 - 850 = -130
-130 ÷ 850 = -0.15294117647058825
-0.15294117647058825 x 100 = -15.29%