-16.47% is the change from 850 to 710
Calculation steps:
[( 710 - 850 ) ÷ 850] x 100 = -16.47%
Formula
Percentage change = [(710 - 850) / 850] x 100
Subtract the new number by the original number
710 - 850 = -140
-140 ÷ 850 = -0.16470588235294117
-0.16470588235294117 x 100 = -16.47%