Flash Calculator beginner

greetings,

I’m currently trying to build a small calculating form in flash mx 2004. it is very simple but as i’m a beginner i dont know where to start. I have looked at a heap of tutorials but they are too complex and are not for my exact issue.

All i have is 2 input boxes, where the user enters 2 different amounts and then a drop down box with 5 different options. once the user enters the amounts and chooses one of the 5 options then all i need it to do is to calculate a result from those inputs. Example:

input 1: 500

input 2: 300

drop down: option 1 (value of 2.3)

then it would calculate (500 * the value of option 1) + (300 + * value of option 1) + 5%.

thats about it in a nutshell. then the result would show the finished calculations.

Any ideas of what i could do to begin or helpful tutorials that could set me of?

thanks