-40.91% is the change from 550 to 325
Calculation steps:
[( 325 - 550 ) ÷ 550] x 100 = -40.91%
Formula
Percentage change = [(325 - 550) / 550] x 100
Subtract the new number by the original number
325 - 550 = -225
-225 ÷ 550 = -0.4090909090909091
-0.4090909090909091 x 100 = -40.91%