-35.93% is the change from 615 to 394
Calculation steps:
[( 394 - 615 ) ÷ 615] x 100 = -35.93%
Formula
Percentage change = [(394 - 615) / 615] x 100
Subtract the new number by the original number
394 - 615 = -221
-221 ÷ 615 = -0.359349593495935
-0.359349593495935 x 100 = -35.93%