Excel Foruma to calculate down payment

Hi All, 

It has been a while since I've done anything related to this in excel and Google is not being my best friend right now.

I have an excel spreadsheet that Column A that has the loan amount, and Row 1 has the percentage rates that is used as the down payment.

Now I know a loan of $250,000 with 20% down is $20,000, but when I put that in my spreadsheet as =A149003-AN1 comes up with $249,999.80.. so obviously that is wrong.

Can anyone help me with what I know is an easy problem, but I can't figure it out to save my life.