-89.63% is the change from 829 to 86
Calculation steps:
[( 86 - 829 ) ÷ 829] x 100 = -89.63%
Formula
Percentage change = [(86 - 829) / 829] x 100
Subtract the new number by the original number
86 - 829 = -743
-743 ÷ 829 = -0.8962605548854041
-0.8962605548854041 x 100 = -89.63%