Biggest factors are probably where you are located, and the curb-appeal of your photographs for the market that is available to you. Mathematics only enters into the equation in the form of making sure you don't rob yourself, but is otherwise useless for pricing or predicting performance within any particular market.
As a sort of ballpark, if you are getting less that about $20 per square foot of print area, you had better have another source of income if you want to stay in fine art photography. So for entry level, low-ball pricing think something like $40 base + $20 per square foot...and you need to move up from that ASAP as you start to make sales based on who you are. If you are paying a service to make your prints, you need to charge a lot more.
I know that 90% of my private customers could care less about editions or paper type, they simply buy those images that viscerally grab them (merely pretty pictures are not enough, but that's another story). OTOH, I do have a few collectors for whom I reserve the "single digit" numbers on numbered but unlimited editions, and that seems to satisfy them. BTW it also helps to write "To Joe and Mary, blah blah blah..." on the backs of prints, collectors want something that sets the print aside as something special, a handwritten message in some ways beats a "2/20" scribble.
Edition sizes have a lot do with price, lately I've been seeing "edition of 6" on a lot of big pricey prints from the big names. I recently saw a 30" x 96" edition-of-six print valued at more than my house. When I was editioning, I usually did 100, but I only charged as much as my dishwasher. Editioning is basically a PITA, there are all sorts of complications about what comprises an "edition" that may or may not allow the photographer some wiggle room that may or may not piss off his existing customers. I hear some states even have laws governing what comprises an art edition, who needs that stuff!