-47.56% is the change from 328 to 172
Calculation steps:
[( 172 - 328 ) ÷ 328] x 100 = -47.56%
Formula
Percentage change = [(172 - 328) / 328] x 100
Subtract the new number by the original number
172 - 328 = -156
-156 ÷ 328 = -0.47560975609756095
-0.47560975609756095 x 100 = -47.56%