Study the given hierarchical class diagram and additional information, and answer the questions that follow:
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Sale
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Company: string
unitPrice: double
qty: int
salesAmt: double
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Sale(string, double, int);
getCompany():string;
getUnitPrice():double;
getQty():int;
getSalesAmt():double;
computeRevenue():double;
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HardwareSale
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installFee: double
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hWSale(string, double, int, double)
computeRevenue():double
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Sale(string, double, int);
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Constructor that initializes the respective data members to the pass in values. salesAmt is set to 0.
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getCompany():string;
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Returns the company
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getUnitPrice():double;
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Returns the unit price
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getQty():int;
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Returns the quantity
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getSalesAmt():double;
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Returns the sales amount
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computeRevenue():double;
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Sets sales amount = unit price * quantity. Returns this computed value.
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hWSale(string, double, int, double)
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Invokes the base class constructor and sets install fees accordingly
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computeRevenue():double
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Sets sales amount = unit price * quantity + install fees
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(a) Write the class specification and code to implement the following classes, fulfilling the given requirements:
(i) Sale (base class)
(ii) HardwareSale(derived class)