-50% is the change from 260 to 130
Calculation steps:
[( 130 - 260 ) ÷ 260] x 100 = -50%
Formula
Percentage change = [(130 - 260) / 260] x 100
Subtract the new number by the original number
130 - 260 = -130
-130 ÷ 260 = -0.5
-0.5 x 100 = -50%
Example