That's exactly what I was going to post:  "Your shares comes to...."

I had to start doing that with a "friend," because I would say, "Let's just split the check in half" until I noticed that she was choosing the most expensive items on the menu.  If, by chance, my meal was more than hers, even by $1, she'd grab the check and figure out how much she owed.  The first time I told her how much her share came to after she had ordered an expensive meal, wine and dessert, she got a shocked look on her face, but she couldn't say anything about it!  

A lot of rich people are cheap, though.  That's how they got rich in the first place.