This profit spreadsheet calculator will help you see what effect the price you buy things for and what you sell them for will have on your bottom line net profits.
Go through your last 6 transactions … then simply enter in the boxes what you bought your goods in for, and enter what you sold them for. Have a look at your net profit figures and play about with your numbers.
How much would decreasing your costs or increasing your income affect your net profit figure? You will be surprised!
This will also show you what difference small changes to your pricing will make to your net profits too.