5.5% is the change from 400 to 422
Calculation steps:
[( 422 - 400 ) ÷ 400] x 100 = 5.5%
Formula
Percentage change = [(422 - 400) / 400] x 100
Subtract the new number by the original number
422 - 400 = 22
22 ÷ 400 = 0.055
0.055 x 100 = 5.5%
Example