How much does it cost to develop a mobile app for a small business in 2025?

I want to know the real cost range for developing a mobile app for a small business in 2025.
Please share your experience, country-based prices, and what features increase the cost (e.g., login, payments, admin panel, push notifications).

Answerers can add:

Approx cost in their country
Average timeline
Best way to hire developers
Hidden costs