-36.91% is the change from 615 to 388
Calculation steps:
[( 388 - 615 ) ÷ 615] x 100 = -36.91%
Formula
Percentage change = [(388 - 615) / 615] x 100
Subtract the new number by the original number
388 - 615 = -227
-227 ÷ 615 = -0.36910569105691055
-0.36910569105691055 x 100 = -36.91%