-82.1% is the change from 838 to 150
Calculation steps:
[( 150 - 838 ) ÷ 838] x 100 = -82.1%
Formula
Percentage change = [(150 - 838) / 838] x 100
Subtract the new number by the original number
150 - 838 = -688
-688 ÷ 838 = -0.8210023866348448
-0.8210023866348448 x 100 = -82.1%