-30.03% is the change from 879 to 615
Calculation steps:
[( 615 - 879 ) ÷ 879] x 100 = -30.03%
Formula
Percentage change = [(615 - 879) / 879] x 100
Subtract the new number by the original number
615 - 879 = -264
-264 ÷ 879 = -0.3003412969283277
-0.3003412969283277 x 100 = -30.03%