-29.15% is the change from 868 to 615
Calculation steps:
[( 615 - 868 ) ÷ 868] x 100 = -29.15%
Formula
Percentage change = [(615 - 868) / 868] x 100
Subtract the new number by the original number
615 - 868 = -253
-253 ÷ 868 = -0.29147465437788017
-0.29147465437788017 x 100 = -29.15%