-50% is the change from 408 to 204
Calculation steps:
[( 204 - 408 ) ÷ 408] x 100 = -50%
Formula
Percentage change = [(204 - 408) / 408] x 100
Subtract the new number by the original number
204 - 408 = -204
-204 ÷ 408 = -0.5
-0.5 x 100 = -50%
Example