Reply by MsDebbieP

I have no clue as to what the costing factor is. I’ll just throw this in, in case it gives you another idea which might generate another idea (and so on and so on)
For my photos, I used to take the cost of the film/developing and double it to provide for my time and then add another (=triple) to give me enough money to buy the next film/developing. Nothing fancy but then I wasn’t a “professional professional” either

-- ~ Debbie, Canada (http://www.execulink.com/~yohan)