-88.31% is the change from 847 to 99
Calculation steps:
[( 99 - 847 ) ÷ 847] x 100 = -88.31%
Formula
Percentage change = [(99 - 847) / 847] x 100
Subtract the new number by the original number
99 - 847 = -748
-748 ÷ 847 = -0.8831168831168831
-0.8831168831168831 x 100 = -88.31%