-50% is the change from 410 to 205
Calculation steps:
[( 205 - 410 ) ÷ 410] x 100 = -50%
Formula
Percentage change = [(205 - 410) / 410] x 100
Subtract the new number by the original number
205 - 410 = -205
-205 ÷ 410 = -0.5
-0.5 x 100 = -50%
Example