22.5% is the change from 400 to 490
Calculation steps:
[( 490 - 400 ) ÷ 400] x 100 = 22.5%
Formula
Percentage change = [(490 - 400) / 400] x 100
Subtract the new number by the original number
490 - 400 = 90
90 ÷ 400 = 0.225
0.225 x 100 = 22.5%
Example