-20.78% is the change from 409 to 324
Calculation steps:
[( 324 - 409 ) ÷ 409] x 100 = -20.78%
Formula
Percentage change = [(324 - 409) / 409] x 100
Subtract the new number by the original number
324 - 409 = -85
-85 ÷ 409 = -0.2078239608801956
-0.2078239608801956 x 100 = -20.78%