-85.89% is the change from 815 to 115
Calculation steps:
[( 115 - 815 ) ÷ 815] x 100 = -85.89%
Formula
Percentage change = [(115 - 815) / 815] x 100
Subtract the new number by the original number
115 - 815 = -700
-700 ÷ 815 = -0.8588957055214724
-0.8588957055214724 x 100 = -85.89%