Before we start, let us figure out what profit means?
Profit is the money you make.
Note: Income is the money you receive, and expenses are the money you spend on your business.
If you sold five frames, you would make: (8.50 x 5 = $42.50)
Note: $42.50 is not greater than your expenses, so you haven't make any profit yet.
If you sold six frames, you would make: (8.50 x 6 = $51.00)
Note: $51.00 is greater than your expenses, so you made some profit.
To find the money you made or your profit, simply subtract the money you received from your expenses.
$51.00 - $46.00 = $5.00
You only made $5.00, but to make a larger profit, you have to sell more frames.
I hope my explanation provided excellent aid. Oh, and you're welcome.