Sales Data Collection App for Android

I'm looking for a skilled Android developer to create an app that collects and processes daily sales data for shops. The app should be able to calculate:

- Total sales
- Sales growth percentage
- Average sales per day

Ideal skills and experience:
- Proficient in Android app development
- Experience with data collection and processing
- Strong understanding of sales metrics and calculations
- Ability to create a user-friendly interface

Please provide examples of similar projects you've completed.