-77.56% is the change from 615 to 138
Calculation steps:
[( 138 - 615 ) ÷ 615] x 100 = -77.56%
Formula
Percentage change = [(138 - 615) / 615] x 100
Subtract the new number by the original number
138 - 615 = -477
-477 ÷ 615 = -0.775609756097561
-0.775609756097561 x 100 = -77.56%