-24.26% is the change from 408 to 309
Calculation steps:
[( 309 - 408 ) ÷ 408] x 100 = -24.26%
Formula
Percentage change = [(309 - 408) / 408] x 100
Subtract the new number by the original number
309 - 408 = -99
-99 ÷ 408 = -0.2426470588235294
-0.2426470588235294 x 100 = -24.26%