Scoring accuracy

Hi all!

I have a huge (50-question) quiz set up with a manually-built timer. When the timer runs out, the user is taken to the scoring page. So, the point is not to get all the answers right (that's impossible). It's to answer as many questions correctly as you can. 

I was wondering if there's any way to rig up an 'accuracy score'? This would be a percentage calculation of questions answered correctly / total answer attempts made (correct and incorrect).

The catch is, of course, that questions NOT attempted can't be counted.

Is there some kind of variable I can use to track incorrect answers only?

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