I am trying to build a list of drop down entries that each has a weight and calculate a final score based on the selections.

For example:

Select color (blue =1, red =2, yellow =3) - Users selects red - Output = 2
Select Town (Boston=1, New York=2, LA = 3) - Users selects LA - Output = 3
etc... -----------------
Final Score = 5

I can create a drop down list but having hard time assigning the weight to the output box.

Any suggestions?