-85.03% is the change from 815 to 122
Calculation steps:
[( 122 - 815 ) ÷ 815] x 100 = -85.03%
Formula
Percentage change = [(122 - 815) / 815] x 100
Subtract the new number by the original number
122 - 815 = -693
-693 ÷ 815 = -0.8503067484662576
-0.8503067484662576 x 100 = -85.03%