-29.87% is the change from 877 to 615
Calculation steps:
[( 615 - 877 ) ÷ 877] x 100 = -29.87%
Formula
Percentage change = [(615 - 877) / 877] x 100
Subtract the new number by the original number
615 - 877 = -262
-262 ÷ 877 = -0.29874572405929306
-0.29874572405929306 x 100 = -29.87%