-88.59% is the change from 850 to 97
Calculation steps:
[( 97 - 850 ) ÷ 850] x 100 = -88.59%
Formula
Percentage change = [(97 - 850) / 850] x 100
Subtract the new number by the original number
97 - 850 = -753
-753 ÷ 850 = -0.8858823529411765
-0.8858823529411765 x 100 = -88.59%