-49.27% is the change from 615 to 312
Calculation steps:
[( 312 - 615 ) ÷ 615] x 100 = -49.27%
Formula
Percentage change = [(312 - 615) / 615] x 100
Subtract the new number by the original number
312 - 615 = -303
-303 ÷ 615 = -0.4926829268292683
-0.4926829268292683 x 100 = -49.27%