-21.95% is the change from 615 to 480
Calculation steps:
[( 480 - 615 ) ÷ 615] x 100 = -21.95%
Formula
Percentage change = [(480 - 615) / 615] x 100
Subtract the new number by the original number
480 - 615 = -135
-135 ÷ 615 = -0.21951219512195122
-0.21951219512195122 x 100 = -21.95%