Like everyone has said, it'll take longer than you think.
If the legs and frame work is made of wood, give them a wipe down after you hwe each chair.
I like the fact how everyone starts shooting high prices on here

I mean really?? Pintch of salt springs to mind!!
Its ok if you have no competion in your town or your only competion is Chempoope or a fast traker. But realistically, if you "want" the commercial work your prices sound about right. I'd even knock a 10er off the total.