-40.63% is the change from 315 to 187
Calculation steps:
[( 187 - 315 ) ÷ 315] x 100 = -40.63%
Formula
Percentage change = [(187 - 315) / 315] x 100
Subtract the new number by the original number
187 - 315 = -128
-128 ÷ 315 = -0.40634920634920635
-0.40634920634920635 x 100 = -40.63%