-88.19% is the change from 838 to 99
Calculation steps:
[( 99 - 838 ) ÷ 838] x 100 = -88.19%
Formula
Percentage change = [(99 - 838) / 838] x 100
Subtract the new number by the original number
99 - 838 = -739
-739 ÷ 838 = -0.8818615751789977
-0.8818615751789977 x 100 = -88.19%