-15.65% is the change from 850 to 717
Calculation steps:
[( 717 - 850 ) ÷ 850] x 100 = -15.65%
Formula
Percentage change = [(717 - 850) / 850] x 100
Subtract the new number by the original number
717 - 850 = -133
-133 ÷ 850 = -0.1564705882352941
-0.1564705882352941 x 100 = -15.65%