100% is the change from 26 to 52
Calculation steps:
[( 52 - 26 ) ÷ 26] x 100 = 100%
Formula
Percentage change = [(52 - 26) / 26] x 100
Subtract the new number by the original number
52 - 26 = 26
26 ÷ 26 = 1
1 x 100 = 100%
Example