I have a spreadsheet with several rows with a letter in each cell. I'm
looking for a formula that will add up the number of cells in the row with
certain letters in them, and divide that by the total number of cells in the
row that have a letter in them. I'm looking for the percentage, to be
specific, of cells that only have a P,T,L,TL, in the row, from the cells that
have a P,T,L,TL,A,U. It's a little too above me.