Materials gotta have a markup, all the taxes,supplier paperwork,etc must not only be passed on, ya gotta make at least 10% bare minimum for anything that goes thru your books.

If i buy a part for $10, i will pay sales tax of 5%, if i sell it to you it will constitute taxable income for me, etc. Those quarterly checks to big bro help me understand the math.

If you wanna go to home depot or lowes, go right ahead. Don't ask that i stand behind the product.

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