-21.02% is the change from 847 to 669
Calculation steps:
[( 669 - 847 ) ÷ 847] x 100 = -21.02%
Formula
Percentage change = [(669 - 847) / 847] x 100
Subtract the new number by the original number
669 - 847 = -178
-178 ÷ 847 = -0.2101534828807556
-0.2101534828807556 x 100 = -21.02%