-79.67% is the change from 836 to 170
Calculation steps:
[( 170 - 836 ) ÷ 836] x 100 = -79.67%
Formula
Percentage change = [(170 - 836) / 836] x 100
Subtract the new number by the original number
170 - 836 = -666
-666 ÷ 836 = -0.7966507177033493
-0.7966507177033493 x 100 = -79.67%