[paperfishies]

If you're just wanting to cover the costs of the makeup being used, it would only be like $5-$8, not $20. However if you are wanting to make a profit, I say go for it and charge them the $20. They wouldn't be able to get their makeup done anywhere else for $20 and IMO there is no problem asking them to pay you, after all your spending you're time, possibly using your car and gas to get to them, etc. I think the $20 would cover all of that.

If you really want to figure out the cost of each application, in terms of foundation, powder, primer, etc. Take the price of the product and divide that by the number of uses you will get out of it...sooo

if you paid $40 for a bottle of foundation and can get 45 uses out of it (that's a super low estimate as far as uses go) that would come out to .89 cents per use. Depending on your method of application, you can probably get upwards of 90 uses out of a bottle of foundation, which would come out to about .44 cents an application.