Count specific values from checkboxes

Hi,

I have some checkboxes arranged in columns (days of the week) where it contains 03 items: P (Participants) = 1, F (missing) = 1 and "-" (absent) = 0.
Below I have 3 boxes of text, where I want to make the following calculations:
Cx 01: add only all the items P and F that are selected in the column;
Cx 02: Count only those that were selected with P
Cx 03: Divide Cx 02 by Cx 01 (%)

Is there any way to do this?