-50% is the change from 206 to 103
Calculation steps:
[( 103 - 206 ) ÷ 206] x 100 = -50%
Formula
Percentage change = [(103 - 206) / 206] x 100
Subtract the new number by the original number
103 - 206 = -103
-103 ÷ 206 = -0.5
-0.5 x 100 = -50%
Example