-12.85% is the change from 615 to 536
Calculation steps:
[( 536 - 615 ) ÷ 615] x 100 = -12.85%
Formula
Percentage change = [(536 - 615) / 615] x 100
Subtract the new number by the original number
536 - 615 = -79
-79 ÷ 615 = -0.12845528455284552
-0.12845528455284552 x 100 = -12.85%