-45.4% is the change from 315 to 172
Calculation steps:
[( 172 - 315 ) ÷ 315] x 100 = -45.4%
Formula
Percentage change = [(172 - 315) / 315] x 100
Subtract the new number by the original number
172 - 315 = -143
-143 ÷ 315 = -0.45396825396825397
-0.45396825396825397 x 100 = -45.4%