-79.38% is the change from 839 to 173
Calculation steps:
[( 173 - 839 ) ÷ 839] x 100 = -79.38%
Formula
Percentage change = [(173 - 839) / 839] x 100
Subtract the new number by the original number
173 - 839 = -666
-666 ÷ 839 = -0.7938021454112039
-0.7938021454112039 x 100 = -79.38%