For \(0.4\%\) of \(N\) to be whole, \(N\) must be divisible by \(250\). For \(\displaystyle 125\%=\frac54\) of \(N\) to be whole, \(N\) must also be divisible by four.

Write \(N=250k\). Since \(250k\) is divisible by four only when \(k\) is even, \(N\) must be a multiple of five hundred. The positive such multiples below two thousand are five hundred, one thousand and one thousand five hundred.

For the smallest, \(\displaystyle \frac1{250}\times500=2\) and \(\displaystyle \frac54\times500=625\).

Answer

Possible values: \(N=500,1000,1500\). For \(N=500\), the two amounts are \(2\) and \(625\).