100% is the change from 130 to 260
Calculation steps:
[( 260 - 130 ) ÷ 130] x 100 = 100%
Formula
Percentage change = [(260 - 130) / 130] x 100
Subtract the new number by the original number
260 - 130 = 130
130 ÷ 130 = 1
1 x 100 = 100%
Example