100% is the change from 55 to 110
Calculation steps:
[( 110 - 55 ) ÷ 55] x 100 = 100%
Formula
Percentage change = [(110 - 55) / 55] x 100
Subtract the new number by the original number
110 - 55 = 55
55 ÷ 55 = 1
1 x 100 = 100%
Example