Hi. My understanding is, that's not normally the intention of a privacy policy, which is to explain things like what the app does with your personal data. Have a look here for some guidelines:
If you want to make your app paid-for, then that detail is included in the app's Google Store page, which will clearly state any up front purchase fee, or specify that the app has in-app purchases. I haven't seen any privacy policies which include details of fees.
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