How does Apple make money from apps?

Related questions

1. Can a person have more than one Apple ID?
2. How does Apple make money on apps?
3. How much does it cost to design an app?
4. What is an Apple Developer Program?
5. How much cut does Apple take from App Store?
6. How long does it take to get a DUNS number?
7. Does this organization hold an active Apple Developer Program membership?
8. Do I need a DUNS number?
9. Why do I need a Apple developer account?
10. Is Apple developer account free?

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