-27.94% is the change from 315 to 227
Calculation steps:
[( 227 - 315 ) ÷ 315] x 100 = -27.94%
Formula
Percentage change = [(227 - 315) / 315] x 100
Subtract the new number by the original number
227 - 315 = -88
-88 ÷ 315 = -0.27936507936507937
-0.27936507936507937 x 100 = -27.94%