Making a dial pie chart

Hello,

I want to create a non-graded question where there user adjusts a pie chart to display the percentage for the answer. I would like the fill of the pie chart to adjust to show the percentage.

The correct answer is not a round number (e.g. 57%) so my original idea of using multiple states in 5 or 10 degree increments won't work - it needs to be done in 1% increments. I don't want to have 360 states to get it to display! I've seen an example or two online (e.g. elearningdesigner.com) that I could make work, but I can't tell how it was achieved.

Can anyone help me?

Thanks!

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