How do I know which CPA is proper to scale my Facebook ad campaigns

How do I know which CPA is proper to scale my Facebook ad campaigns Hi, I'm starting in this e-commerce World, and I don't know anything about Facebook ad campaigns. I have a product that costs 20$ and gives 5$ profit, and I can pay 7$/day for advertising. How do I know if I should invest more in ads? Which CPA is normal? Or Which CPA should I aim for?
submitted by /u/Ok118

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