-66.79% is the change from 843 to 280
Calculation steps:
[( 280 - 843 ) ÷ 843] x 100 = -66.79%
Formula
Percentage change = [(280 - 843) / 843] x 100
Subtract the new number by the original number
280 - 843 = -563
-563 ÷ 843 = -0.66785290628707
-0.66785290628707 x 100 = -66.79%