score in percentage format in result slide

Hi,

How could i calculate percentage automatically from score? 

I have created a number variable (score) to add 20 in every right option and add 5 in partial. I want to show the percentage (based on score) in result slide. I want to show the score in percentage. Example 50 / 100 = 50%. 

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

Thanks

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