-28.07% is the change from 855 to 615
Calculation steps:
[( 615 - 855 ) ÷ 855] x 100 = -28.07%
Formula
Percentage change = [(615 - 855) / 855] x 100
Subtract the new number by the original number
615 - 855 = -240
-240 ÷ 855 = -0.2807017543859649
-0.2807017543859649 x 100 = -28.07%