That reminds me of an invoice I received for a tune-up on my Monte Carlo back in the 70's. The Chevy dealer charged list price on spark plugs, etc. and I wasn't real happy with the total. The last line on the itemized bill was "NP42" with a quantity of 1 and showed a cost per each of several dollars. I called and asked what an NP was. They told me Net Profit.
That was the last time I had that dealership do work for me.