1.5% is the change from 400 to 406
Calculation steps:
[( 406 - 400 ) ÷ 400] x 100 = 1.5%
Formula
Percentage change = [(406 - 400) / 400] x 100
Subtract the new number by the original number
406 - 400 = 6
6 ÷ 400 = 0.015
0.015 x 100 = 1.5%
Example