-79.59% is the change from 838 to 171
Calculation steps:
[( 171 - 838 ) ÷ 838] x 100 = -79.59%
Formula
Percentage change = [(171 - 838) / 838] x 100
Subtract the new number by the original number
171 - 838 = -667
-667 ÷ 838 = -0.7959427207637232
-0.7959427207637232 x 100 = -79.59%