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

Question

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]

Answer 1

Create a database table with 3 columns
Country
ToRate
FromRate
Populate these values as appropriate.
Create two drop down menus on your page; FromRate and ToRate.  Populate these with the values (Display value and rate) from the table.
Then, you could either:
1) Submit the form to a server side script that adds and displays the values
2) Use Javascript to add and display the values