-2.44% is the change from 615 to 600
Calculation steps:
[( 600 - 615 ) ÷ 615] x 100 = -2.44%
Formula
Percentage change = [(600 - 615) / 615] x 100
Subtract the new number by the original number
600 - 615 = -15
-15 ÷ 615 = -0.024390243902439025
-0.024390243902439025 x 100 = -2.44%