-89.76% is the change from 850 to 87
Calculation steps:
[( 87 - 850 ) ÷ 850] x 100 = -89.76%
Formula
Percentage change = [(87 - 850) / 850] x 100
Subtract the new number by the original number
87 - 850 = -763
-763 ÷ 850 = -0.8976470588235295
-0.8976470588235295 x 100 = -89.76%