Calculating percent of dropdown values selected in a cell

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I have a multiple select drop down column that has 10 possible values. It's being used as a checklist. I want to calculat the % of values selected in that cell. So for instance. If I checked off 6 things in the drop down out of a possible 10, the formula would return 60%. I know to use COUNTM to count the number of selected values, but how do I count the number of possible Values (10 in this case) that will change as I add or subtract values?

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