Creating custom fields based on selection of fields i need to get result and total result in another custom fields in sugarcrm 7

Hello Frieds

I want to create a Three Radio box with lable on top, then i want one text box (Salary).

When their check from Four Radio box based on that i need to display the value on text box (Salary).

Example: How much experience you have?

1 Year - if we select then Salary should be 10

2 Year - if we select then Salary should be 20

5 Year - if we select then Salary should be 50

10 Year - if we select then Salary should be 100

Like this i want all 3 Radio Lable boxes.

Finally all this 3 Radio Lable boxes Salary value should be display on another Text Box i.e Total Salary.

How i can achieve this in best way.

Can anyone please guide me on this

Thanks in Advance Ramana Raju Santhana

Regards

Sam Roy