How to use a number variable to determine a percentage

I have created an exercise with 19 questions in Storyline 1. Each question has a "Correct" and an "Incorrect" layer. I want to have a simple Results slide that shows how many questions the learner got right, and what percentage that is of 19.

I created a variable called NumberCorrect, which starts at 0 and increases by 1 each time the timeline starts on a question's "Correct" layer. What I can't figure out is what to do to fill in the blank here:

You answered %NumberCorrect% of 19 questions correctly, for a score of ___%.

I have a feeling this is simple, but I'm stuck. Can someone please enlighten me?

Thanks!

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