-23.25% is the change from 843 to 647
Calculation steps:
[( 647 - 843 ) ÷ 843] x 100 = -23.25%
Formula
Percentage change = [(647 - 843) / 843] x 100
Subtract the new number by the original number
647 - 843 = -196
-196 ÷ 843 = -0.232502965599051
-0.232502965599051 x 100 = -23.25%