How Can I Use Variables to Score Interactions?

I've created a course. Each slide as a question/scenario and three buttons. Two wrong answers and one right. When you choose any of the buttons you get a feedback box that explains why you were right or wrong. These are not quiz slides, but I would like to use variables to score the slides if I could.
My idea was to create a variable and call it congrats. The variable as a sum of zero. Is it possible for me to add a numerical value to that variable each time a person chooses one of the buttons?
For example:
I wanted to add 10 to the variable if you choose the right answer. I wanted to give the incorrect answers a value of -5. In other words. You could either end up with 10 points on a slide if you choose the correct answer or 0 points if you choose the 2 incorrect answers and the correct answer, or 5 points if you choose a incorrect and correct answer.
At the end, I would like you come to a slide. this slide will be based on the value of that variable at the end. Either you have a 100 or lower depending on how you did.
I hope this isn't too confusing.
Any and all help is appreciated.
Thanks!

You forgot one important detail: has the score to be transmitted to a LMS or is it only meant to be shown in the Captivate file?
And which version are you using? The easiest way to achieve this is to use the partial scoring (and penalty) that is already available for MCQ slides with multiple correct answers.
I have a lot of stuff on my blog about that type of scoring. Besides question slides, only interactive objects can have a score, everything you can find in the Advanced Interaction panel (F9). Here are some articles I wrote:
Report Custom Questions - part 1 - Captivate blog
Report Custom Questions - part 2 - Captivate blog

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