-50% is the change from 406 to 203
Calculation steps:
[( 203 - 406 ) ÷ 406] x 100 = -50%
Formula
Percentage change = [(203 - 406) / 406] x 100
Subtract the new number by the original number
203 - 406 = -203
-203 ÷ 406 = -0.5
-0.5 x 100 = -50%
Example