If your tiers are 4" high then your cake will serve 122 servings at a size of 1"x2"x4" (standard wedding and desert size) If you are only doing one layer of cake (2" high) in each tier then you will have about 61 servings of 2"x2"x2" (same amount of cake as above, just cut differently)

As for price, if you want to make money on this then you need to figure out howmuch per hour you want to make.

But first you will need to know how much your ingredients will cost you.

I don't know how many cups of batter one recipe of the WASC makes, however even for one layer of each of those sizes you will need a total of 19 cups of batter, so if you are doing two layers in each tier then you will need 38 cups of batter. I use a doctored box mix and get 6 cups of batter out of one box so I would need about 3 boxes for 2" tall cakes and 6 boxes for 4" tall cakes.

If I confused you let me know and I can try to break that down a little easier b/c i got wordy.

HTH