-98.85% is the change from 866 to 10
Calculation steps:
[( 10 - 866 ) ÷ 866] x 100 = -98.85%
Formula
Percentage change = [(10 - 866) / 866] x 100
Subtract the new number by the original number
10 - 866 = -856
-856 ÷ 866 = -0.9884526558891455
-0.9884526558891455 x 100 = -98.85%