Wow. Only 20%.
Do they do framing?
How big is the gallery and is it in an art district?
When you have time while your images are hanging in the gallery, will they let you spend time at the gallery so potential buyers can talk to you.
Yif you're not already familiar, you have time to learn about framing and presentation.
For display in the galley I recommend Nielsen metal frames. Wood frames are acidic, metal frames aren't.
Fine art inkjet prints made using solvent based dyes on fine art paper, using museum print mounting techniques (hinge mount), museum quality mount board and mat materials that are acid free, and quality glazing are not inexpensive when all put together.
Glazing has to kept away from the print. That's part of what a mat does, though a mat also helps visually isolate the print from whatever wall it hangs on.
They make spacers that can keep glazing from touching the print so a print can be framed without a mat, but you lose the isolation.
Cheap mount and mat materials aren't acid free.
No matter how acid-free a paper may be immediately after manufacture, over time chemicals from processing or pollutants from the air may lead to the formation of acid in the paper. The presence of an alkaline buffer will reduce or eliminate damaging effects of these acids for the duration of the buffer's effectiveness. The most common buffering additive is calcium carbonate. Some acidic materials are chemically neutralized with the addition of alkaline products; other materials are processed to remove the acid.
Being able to tell potential buyers about the print type (chromogenic (C-print) or inkjet), paper the print is on, the date the print was made,and the framing materials/techniques used helps to support an asking price, particularly when you can say "museum quality materials and techniques".
Fine art inkjet prints generally stay color fast longer than C-prints, but quality C-prints that suffer little from degrading environmental conditions will likely last longer than you do.