While importing data into tableau don't import total column (it is redundant here). By posting your data you have made it clear that you have data reshaping issue. Proceed like this-
Step-1 While importing/connecting to worksheet, click app1 and app2 columns and then pivot
them both. screenshot

Rename these fields as per taste. I have re-named these as app name
and val
respectively.
Step-2 Create a calculated field as
{FIXED [App name]: sum([val])}/{sum([val])}
and build a view like this. (Format calculation1 as percentage)

Good Luck.