0.25% is the change from 400 to 401
Calculation steps:
[( 401 - 400 ) ÷ 400] x 100 = 0.25%
Formula
Percentage change = [(401 - 400) / 400] x 100
Subtract the new number by the original number
401 - 400 = 1
1 ÷ 400 = 0.0025
0.0025 x 100 = 0.25%
Example