Calculate true false for pie chart and percentage

I'm new and am probably searching for this incorrectly, if someone can point me in the right direction it would be much appreciated.

I made an appsheet with 60 questions. I'd like to display how many are answered true and how many are false in a pie chart. I'm guessing there is an expression I need to create or virtual column with a count?

I'd also like to see a score or percentage based on that result, for example: If out of 60 total questions, 42 were true then the score would be 70%.

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The Chart view would do that without additional calculations. 

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