30.5% is the change from 400 to 522
Calculation steps:
[( 522 - 400 ) ÷ 400] x 100 = 30.5%
Formula
Percentage change = [(522 - 400) / 400] x 100
Subtract the new number by the original number
522 - 400 = 122
122 ÷ 400 = 0.305
0.305 x 100 = 30.5%
Example