The fact that you plan to continue to sell the app and earn money doing so, would likely put you into the self-employment category more than the hobby as this is done with an intent to earn money, not just as something you do for pleasure and happen to make money doing or are just making enough to support your hobby.
Whatever number Apple is giving you is the number you will use as a starting point. So, if they are telling you the sales were $182 (it seems there should be some place to find a solid number) then you would report the $182 as your income. Then the $55 would be deductible as a business expense if you are going to file as self-employed. If you are choosing to list it as a hobby, then you would still report the $182 and then you could claim it as an itemized expense if you are itemizing your return instead of taking the standard deduction.
Standard versus Itemized Deduction
Hobby versus Business Income
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