Revise the class using inheritance to simplify the codes and to remove repetition of codes

OOP Homework Inheritance
1.    Given two classes as described in (attached)
Revise the class using inheritance to simplify the codes and to remove repetition of codes
2.    Package-delivery services, such as FedEx®, DHL® and UPS®, offer a number of different shipping options, each with specific costs associated. Create an inheritance hierarchy to represent various types of packages.
•    Use class Package as the parent class of the hierarchy, then include classes TwoDayPackage and OvernightPackage that derive from Package.
•    Parent class Package should include attributes representing the sender and recipient of the package (using the classes in Problem 1), in addition to attribute that store the weight (in kg) and cost per kg to ship the package.
•    Package’s constructor should initialize these attributes. Ensure that the weight and cost per kg contain positive values.
•    Package should provide an attribute PackageList which collects all of packages into a list
•    Package should provide a method calculateCost that returns the cost associated with shipping the package. Package’s calculateCost method should determine the cost by multiplying the weight by the cost per kg.
•    Derived class TwoDayPackage should inherit the functionality of parent class Package, but also include an attribute that represents a flat fee that the shipping company charges for two-day-delivery service.
•    TwoDayPackage’s  constructor should receive a value to initialize this attribute. TwoDayPackage should override method calculateCost so that it computes the shipping cost by adding the flat fee to the weight-based cost calculated by class Package’s calculateCost function.
•    Class OvernightPackage should inherit directly from class Package and contain an additional attribute representing an additional fee per kg charged for overnight-delivery service. OvernightPackage should redefine method calculateCost so that it adds the additional fee per kg to the standard cost per kg before calculating the shipping cost
With the following command in the main program,
74 c1 = Sender(‘Ellen’,’Abberton’,’WR10′) 75 c2 = Recipient(‘Jane’,’Abbey Dore’,’HR2′) 76 77 c3 = Sender(‘Mike’,’Agglethorpe’,’DL8′) 78 c4 = Recipient(‘Andy’,’Acton Bridge’,’CW8′) 79
80 c5 = Sender(‘Andy’, ‘Acton Bridge’,’CW8′) 81 c6 = Recipient(‘Luke’,’Abingworth’,’RH20′) 82 83 package1 = Package(c1,c2,2,200) 84 85 package2 = TwoDayPackage(c3,c4,3,210,50) 86 87 package3 = OvernightPackage(c5,c6,2,250,55)
The output should look like the following

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