-87.98% is the change from 815 to 98
Calculation steps:
[( 98 - 815 ) ÷ 815] x 100 = -87.98%
Formula
Percentage change = [(98 - 815) / 815] x 100
Subtract the new number by the original number
98 - 815 = -717
-717 ÷ 815 = -0.8797546012269939
-0.8797546012269939 x 100 = -87.98%