-95.24% is the change from 315 to 15
Calculation steps:
[( 15 - 315 ) ÷ 315] x 100 = -95.24%
Formula
Percentage change = [(15 - 315) / 315] x 100
Subtract the new number by the original number
15 - 315 = -300
-300 ÷ 315 = -0.9523809523809523
-0.9523809523809523 x 100 = -95.24%