3. Design a Java interface called Faculty that includes one method: void CalcLGrade (int il). Design...

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3. Design a Java interface called Faculty that includes one method: void CalcLGrade (int il). Design and implement a class called CSFaculty that implements the Faculty interface. The method CalcL Grade takes one integer number/variable and calculates its corresponding LetterGrade: il >= 90, 80 <= il <90, 70 <=il <80, assign 'C' to LetterGrade; 60 <= il < 70, assign 'D' to LetterGrade; il < 60, assign 'F' to LetterGrade. LetterGrade is a member of CSFaculty. The three file names are: Final_P3, Faculty and CSFaculty. assign 'A' to LetterGrade; assign 'B' to LetterGrade; 3. Design a Java interface called Faculty that includes one method: void CalcLGrade (int il). Design and implement a class called CSFaculty that implements the Faculty interface. The method CalcL Grade takes one integer number/variable and calculates its corresponding LetterGrade: il >= 90, 80 <= il <90, 70 <=il <80, assign 'C' to LetterGrade; 60 <= il < 70, assign 'D' to LetterGrade; il < 60, assign 'F' to LetterGrade. LetterGrade is a member of CSFaculty. The three file names are: Final_P3, Faculty and CSFaculty. assign 'A' to LetterGrade; assign 'B' to LetterGrade;

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