-79.57% is the change from 842 to 172
Calculation steps:
[( 172 - 842 ) ÷ 842] x 100 = -79.57%
Formula
Percentage change = [(172 - 842) / 842] x 100
Subtract the new number by the original number
172 - 842 = -670
-670 ÷ 842 = -0.7957244655581948
-0.7957244655581948 x 100 = -79.57%