-69.78% is the change from 847 to 256
Calculation steps:
[( 256 - 847 ) ÷ 847] x 100 = -69.78%
Formula
Percentage change = [(256 - 847) / 847] x 100
Subtract the new number by the original number
256 - 847 = -591
-591 ÷ 847 = -0.6977567886658795
-0.6977567886658795 x 100 = -69.78%