Use the classes in the above to implement the Grade Calculation program as follows

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1.)    Write a base class that has two property members: name and contact and one method member: CalculateFinalGrade(). must be an Abstract class method must be by its child class. (1 point)
For example,
Student {
Property: StudentName
Property: Contact
Method: CalculateFinalGrade()
}
2.)    Write two child classes and , both of which inherit and implement any abstract member. needs a property for exam score and implements CalculateFinalGrade() to calculate final the grade in LETTER (based on Exam score only). needs two properties, one for exam score and the other for term paper score, and implements CalculateFinalGrade() to calculate the final grade in LETTER (based on both Exam and Team Paper scores). The maximum exam score for both undergraduate and graduate is 250. The maximum term paper score for graduate only is 50. For undergraduate, the final grade is calculated with the formula: (exam score/250). For graduate, the formula is ((exam + term paper)/300). In the CalculateFinalGrade(), the calculated final grade in percentage must be converted to the LETTER grade as (A: >=90%; B: >=80% and <90%; C: >=70% and <80%; D: >=60% and <70%; F: <60%). That is, CalculateFinalGrade() will return a LETTER grade. (2 points) For example, (note: the following are pseudo codes, not C#) UndergraduateStudent : Student { Property: ExamScore Method: CalculateFinalGrade { theExam = ExamScore/250 if theExam >= 0.90 then
finalGrade = “A”
else if theExam >= 0.80 then
finalGrade = “B”
…
else if theExam <= 0.60 then finalGrade = “F” return finalGrade } Note: 1.)    You can have both and to inherit and overrides the CalculateFinalGrade() in each of them. OR inherits and inherits . That is, the CalculateFinalGrade() in is overridden by the same method in its child class , which is further overridden in its child class . 2.)    You can use either switch case… or if .. else if. 3.)    Use the classes in the above to implement the GradeCalculation program as follows. (2 points) In this program, you don’t need to implement data validation (even though I did it in the demo program). Make sure to hide the Term Paper textbox when the undergraduate is selected.

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