-94.29% is the change from 315 to 18
Calculation steps:
[( 18 - 315 ) ÷ 315] x 100 = -94.29%
Formula
Percentage change = [(18 - 315) / 315] x 100
Subtract the new number by the original number
18 - 315 = -297
-297 ÷ 315 = -0.9428571428571428
-0.9428571428571428 x 100 = -94.29%