-20.9% is the change from 847 to 670
Calculation steps:
[( 670 - 847 ) ÷ 847] x 100 = -20.9%
Formula
Percentage change = [(670 - 847) / 847] x 100
Subtract the new number by the original number
670 - 847 = -177
-177 ÷ 847 = -0.2089728453364817
-0.2089728453364817 x 100 = -20.9%