programming assignemnt

We'll use the base class Package and its derived classes TwoDayPackage and OvernightPackage to create an inheritance hierarchy for different sorts of packages. Several files will be used to implement this. Here is the format: We'll use the base class Package and its derived classes TwoDayPackage and OvernightPackage to create an inheritance hierarchy for different sorts of packages. Several files will be used to implement this. Here is the format: package.h: Header file for the Package class; : Implementation file for the Package class; two_day_package.h: Header file for the TwoDayPackage class; overnight_package.h: Implementation file for the OvernightPackage class; : Test program that creates objects of each type of Package and tests the calculateCost member