Enhance C# Calculator with Receipt Printing

I have a small standalone Windows Desktop .NET program (370KB) that has been written in C#. Currently it is purely mathematical in that (via TouchScreen entries) it allows the input of various pre-set values to any one of 8 categories... (Budget: £20 - £250 GBP, Jobs: .NET, C# Programming, Data Management, Desktop Application, Software Development, Windows Desktop)