Mobile Calculator with Graphing

I’d like a simple yet polished mobile calculator app written in Python. It must do the everyday basics—addition, subtraction, multiplication and division—and also offer a graph-plotting screen where I can enter a function such as y = 2x + 3 and see the curve render instantly... (Budget: ₹1500000 - ₹15000000 INR, Jobs: Android, App Design, App Development, Debugging, iPhone, Mobile App Development, Python, User Interface / IA)