-85.98% is the change from 820 to 115
Calculation steps:
[( 115 - 820 ) ÷ 820] x 100 = -85.98%
Formula
Percentage change = [(115 - 820) / 820] x 100
Subtract the new number by the original number
115 - 820 = -705
-705 ÷ 820 = -0.8597560975609756
-0.8597560975609756 x 100 = -85.98%