Hey Joe, that's not profit. (what you pay taxes on). Cost of sales include transportation, insurance, health care,among other things. The taxable income on these rates is more like $20 to $30.
Oh, I understand that, especially for a plumbing business owner.
I just answered the question asked.
Get your plumbing certification, a pickup truck, a phone number in the yellow pages, the tools of the trade, charge $75 an hour, and you can make about $156,000 a year (gross) in a normal working year (40 hours a week).
That's before expenses and before taxes.