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Yes, you can very much do this using the form. Using the Form Calculation Widget, you can create instant quote generator form.
In your example, numerical values can be assigned on the selection options in the drop-down list. And then the numerical values can be computed.
I suggest reviewing this user guide also -How-to-perform-calculation-in-the-form
Here is sample form that have calculations base on selections http://www.jotform.me/form/42022234477448
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