-89.2% is the change from 815 to 88
Calculation steps:
[( 88 - 815 ) ÷ 815] x 100 = -89.2%
Formula
Percentage change = [(88 - 815) / 815] x 100
Subtract the new number by the original number
88 - 815 = -727
-727 ÷ 815 = -0.8920245398773006
-0.8920245398773006 x 100 = -89.2%