Is there any way in Mac OS X to find the total file size of a group of files without creating multiple "Get Info" windows?

A friend of mine has to use a Mac computer at work, and it annoys her that every time she selects a group of files and selects “Get Info” it pulls up windows for each individual file.

In Windows when you select a group of files, it tells you their total file size at the bottom of the window. This is an important feature to her because she must keep files small enough to e-mail.