22.22% is the change from 45 to 55
Calculation steps:
[( 55 - 45 ) ÷ 45] x 100 = 22.22%
Formula
Percentage change = [(55 - 45) / 45] x 100
Subtract the new number by the original number
55 - 45 = 10
10 ÷ 45 = 0.2222222222222222
0.2222222222222222 x 100 = 22.22%