Need to sum numbers in a dropdown multi select cell

I have a multiselect cell that is used to select the time certain training education takes. I have .5 for 30 mins and 1 for an hour. Our educators can also select the 1 and .5 if the education takes an hour and a half. I would like to be able to sum these two if they selected both. I have searched this community and have found the countm and contains but can't seem to figure how to make them sum. Appreciate any insights. Thanks

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