-40.73% is the change from 550 to 326
Calculation steps:
[( 326 - 550 ) ÷ 550] x 100 = -40.73%
Formula
Percentage change = [(326 - 550) / 550] x 100
Subtract the new number by the original number
326 - 550 = -224
-224 ÷ 550 = -0.4072727272727273
-0.4072727272727273 x 100 = -40.73%