-21.6% is the change from 324 to 254
Calculation steps:
[( 254 - 324 ) ÷ 324] x 100 = -21.6%
Formula
Percentage change = [(254 - 324) / 324] x 100
Subtract the new number by the original number
254 - 324 = -70
-70 ÷ 324 = -0.21604938271604937
-0.21604938271604937 x 100 = -21.6%