-81.9% is the change from 315 to 57
Calculation steps:
[( 57 - 315 ) ÷ 315] x 100 = -81.9%
Formula
Percentage change = [(57 - 315) / 315] x 100
Subtract the new number by the original number
57 - 315 = -258
-258 ÷ 315 = -0.819047619047619
-0.819047619047619 x 100 = -81.9%