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1. [15 Points] In Onion Garments Ltd, the employees can be divided into two types based on their way of earning. The first type of employees gets a fixed monthly salary at the end of each month. The salary is calculated by summing basic salary, 30% of the basic salary as house rent, and 5% of basic salary as medical allowance. Employees can also work on an hourly basis who get a salary depending on the number of hours they work in a month. The salary is calculated by multiplying the hours and hourly pay rate. This rate varies from employee to employee. a. [5 points] Design a class Employee with its attributes and methods including an abstract method calculate Salary() which calculates the salary of each employee and a protected attribute which keeps the salary amount. Design two classes FixedSalary Employee and HourlyRate Employee that inherit the Employee class. The class descriptions are given in the UML diagram below. b. [10 points] The sub-classes have to implement the abstract method calculate Salary(). The toString() method is overridden in the two sub-classes to print the name, mobile number, and salary. FixedSalaryEmployee -basic Salary: double Employee #name:String #mobileNum:String #salary: double HourlyBasisEmployee +calculate Salaryo:double (abstract) +toStringo:String -perHourRate:double -totalHours:double