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This seems to be the same question as the one you posted here: http://www.jotform.com/answers/796229
As such and since you have given more details on this thread, I would like to ask you to continue with this through this thread.
This is the link to the same: http://www.jotform.com/answers/796238
I would like to confirm that I have understood you correctly.
You wish to have 5 multiple choice questions on your form. As each is filled out it will add %2 of the current total to the total amount?
If this is not what you mean, do let us know.