Calculate percentage from score

How could i calculate percentage automatically from score?

 

I have created a number variable (score) to add 1 in every slide when user selects right answer.I want to show the percentage (based on score) in result slide.I want to show the score in percentahe.Example 50 / 100 = 50%.

 

I don't want to use Storyline's inbuilt score variable.

 

 

Thanks.

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