I need a calculator how much i earn

IN PROGRESS
Bids
5
Avg Bid (USD)
$22
Project Budget (USD)
$10 - $30

Project Description:
Hi,

i need a calculator for my website.
The Script should only say me, how much i earn.

http://www.entgeltgruppen.net/entgelttabelle.html

this is the foundation of it.
i need a script,where visitors can chose, which Group and step i'am and then the script tell me, how many i earn in the Month.

example

If i chose Entgeltgruppe 10 and Step 4, the result have to be 3481.32

And i want it in ajax, so that no new site have to be loaded.

Just 2 dropdown menus with 1-15Ü and Step 1-5 , and after chose the 2 dropdowns, right or under it, should stand in a div the Result.

Thats all!

Skills required:
AJAX, MySQL, PHP
About the employer:
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