I dunno excactly, but one of my photographer friends charges according to how much it costs to print it out...like the cost of the print would be 10% of the real cost. ex.- $2.00 to print out, and you would charge $20.00....I dunno really, but I hope this gives you an idea.
 

How much do you think you are worth?
Ask yourself if I were the hotel would I pay this amount for the photo I want to sell them?
Customers love good prices.
Even if you add one penny to your cost your still making One Penny profit you didnt have.
The better the prices you have the more your clients will buy annd the more they buy the more pennies go into your pockets.
 

I can't imagine a hotel chain paying gallery prices for art work, but you don't want to work for peanuts either.

I don't sell my work this way, but if I did, I'd probably treat it like any other art work I sell.
selling a $2 print for $20 is fairly arbitrary. Sure, you've more than covered the cost of production, but what is your time worth? How long did it take to produce the final image?

If you spent 4 hours retouching a digital image, and you sell it for $20, subtract the $2 cost to print, you just made $4.50 per hour for your time. This doesn't even take into consideration the time spent in the field actually taking the photo in the first place.

If you're getting into producing images that will generate income for a client, that is another bowl of wax altogether. If you sell an image to a company, say a photo of their product, and you charge them $20 for that image, would you feel like you got ripped off if they use that photo to generate $1,000,000 in sales?
 

Thanks for the advice! That will help out a lot!