Creating a rate calculator [was: how do i create this?]

I want to create a rate calculator on a website with 2 input fields: calling from and calling to.  Here is what i've got:

CALLING FROM table:

COUNTRY     $/MIN

Africa            0.10

Europe          0.20

Asia              0.30

CALLING TO table:

COUNTRY     $/MIN

Africa           0.20

Europe         0.30

Asia             0.50

USA             0.10

Basically to get the rate $/min the CALLING FROM selected country and the CALLING TO selected country will be added together i.e calling from africa to USA would be $0.20/min (0.10 + 0.10).

- How do i create the database for this? (in access)

- How do i then create the rate calculator in a webpage? (asp/php)???

I would really appreciate anyone who will be able to help me in this.

Thank you very much.

Natalie

[Subject line edited by moderator to indicate nature of question]