-31.37% is the change from 408 to 280
Calculation steps:
[( 280 - 408 ) ÷ 408] x 100 = -31.37%
Formula
Percentage change = [(280 - 408) / 408] x 100
Subtract the new number by the original number
280 - 408 = -128
-128 ÷ 408 = -0.3137254901960784
-0.3137254901960784 x 100 = -31.37%