Question

I need help on my programming assignment.
I have to create a form that looks like this.
[IMG]http://i39.tinypic.com/2yoyjio.png[/IMG]
http://i39.tinypic.com/2yoyjio.png

Using that form, I am required to calculate the total cost of my car rental.
Type of vehicle: MUST choose 1
Discounts- MUST choose 3
OPtions- MUST choose 1

My code won't give me the correct numbers; - i need help asap.
I cannot post my code since I am limited w/ the number of characters it will fit, Sorry.