Price Calculation App for Windows

I need a Windows app that calculates the net selling price and percentage profit based on manual entry of the net purchase price. After the calculations, the app should display the results on the screen.

Key Features:
- Windows compatibility
- Manual entry for input
- Display results on screen

Ideal Skills & Experience:
- Experience in Windows app development
- Strong programming skills
- Familiarity with UI/UX for display outputs