C# for Visual studio application

ReadALot Books awards points to customers that can be used for future purchases based on the number of books purchased each month. The points are awarded as specified here. - Purchase of zero books in a month, zero award points are earned. - Purchase of 1 book in a month, 5 award points are earned. - Purchase of 2 books in a month, 15 award points are earned. - Purchase of 3 books in a month, 30 award points are earned. - Purchase of 4 or more books in a month, 60 award points are earned