1% is the change from 400 to 404
Calculation steps:
[( 404 - 400 ) ÷ 400] x 100 = 1%
Formula
Percentage change = [(404 - 400) / 400] x 100
Subtract the new number by the original number
404 - 400 = 4
4 ÷ 400 = 0.01
0.01 x 100 = 1%
Example