-20.78% is the change from 847 to 671
Calculation steps:
[( 671 - 847 ) ÷ 847] x 100 = -20.78%
Formula
Percentage change = [(671 - 847) / 847] x 100
Subtract the new number by the original number
671 - 847 = -176
-176 ÷ 847 = -0.2077922077922078
-0.2077922077922078 x 100 = -20.78%