What did the $350 per outlet include?

One of the best practices i used when I had my business was I never inflated my prices on materials and I explained to all my customers that all the receipts for their job and a time sheet of when I arrived/left were in a folder I kept in the same place on each job site. They always knew where every cent went.
Honestly, it was the smartest thing I did as I would leave it there overnight so they would be comfortable enough to flick through it.
I never advertised my business in the 15yrs I worked it. I didn't bother with printing business cards as everyone just kept passing on my number.
My first boss put me onto that when I first started out on my own.
When I quoted a job, I would itemise every cost individually and then add my labour costs at the end. Customers would see that the bill the would get at the end was not all cream on the top.

Actually, I surprised one of my customers once as I had contracted for them on a huge amount of jobs over three years. She was a silent partner who decided in the end to start running the accounts to save money. She must have had a fit when she went through my three yrs of invoices because she requested I produce all my receipts I billed to them for materials. Truth is she wanted to double dip them to increase their tax returns. Anyway, I fronted up with a box of folders, one for every invoice with included receipts.
They all added up to the cent. She didn't like that.....I billed them for the 4hrs I spent in their office photocopying them. I was the best paid secretary in Sydney for that half day!