-79.85% is the change from 685 to 138
Calculation steps:
[( 138 - 685 ) ÷ 685] x 100 = -79.85%
Formula
Percentage change = [(138 - 685) / 685] x 100
Subtract the new number by the original number
138 - 685 = -547
-547 ÷ 685 = -0.7985401459854015
-0.7985401459854015 x 100 = -79.85%