Question: Given an abstract class, RentableDwelling, containing: a private double instance variable rentPerUnit a public constructor accepting a double used to initialize rentPerUnit a public method

Given an abstract class, RentableDwelling, containing:
a private double instance variable rentPerUnit
a public constructor accepting a double used to initialize rentPerUnit
a public method getRentPerUnit that returns the value of rentPerUnit
a public abstract method getRentalIncome that returns a double
Write a public (non-abstract) subclass, ApartmentHouse, containing:
a private int instance variable, numberOfApartments
a public constructor accepting a double, passed to the superclass constructor, and an int used to initialize numberOfApartments
a public method getRentalIncome that calculates the product of numberOfApartments and the rent per unit. getRentalIncome returns a double

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