Construct a class Person with attributes name, age, address and a methoddisplay() to display the details. Create a subclass Student with attributesrollno, mark1, mark2, and mark3. Override display() method and calculatethe grade. Create another subclass Faculty with attributes faculty_id,department, basic_pay and DA. Override display() method to calculate totalsalary as (basic_pay + DA) + 70% of (basic_pay + DA). Create instances ofStudent and Faculty and display the details

Sure, here is the Python code for the problem:

class Person:
    def __init__(self, name, age, address):
        self.name = name
        self.age = age
        self.address = address

    def display(self):
        print(f"Name: {self.name}, Age: {self.age}, Address: {self.address}")


class Student(Person):
    def __init__(self, name, age, address, rollno, mark1, mark2, mark3):
        super().__init__(name, age, address)
        self.rollno = rollno
        self.mark1 = mark1
        self.mark2 = mark2
        self.mark3 = mark3

    def display(self):
        super().display()
        print(f"Roll No: {self.rollno}, Marks: {self.mark1, self.mark2, self.mark3}, Grade: {self.calculate_grade()}")

    def calculate_grade(self):
        average = (self.mark1 + self.mark2 + self.mark3) / 3
        if average >= 90:
            return 'A'
        elif average >= 80:
            return 'B'
        elif average >= 70:
            return 'C'
        elif average >= 60:
            return 'D'
        else:
            return 'F'


class Faculty(Person):
    def __init__(self, name, age, address, faculty_id, department, basic_pay, DA):
        super().__init__(name, age, address)
        self.faculty_id = faculty_id
        self.department = department
        self.basic_pay = basic_pay
        self.DA = DA

    def display(self):
        super().display()
        print(f"Faculty ID: {self.faculty_id}, Department: {self.department}, Total Salary: {self.calculate_salary()}")

    def calculate_salary(self):
        return (self.basic_pay + self.DA) + 0.7 * (self.basic_pay + self.DA)


# Create instances of Student and Faculty
student = Student('John', 20, '123 Street', 1, 85, 90, 95)
faculty = Faculty('Smith', 45, '456 Avenue', 101, 'Computer Science', 50000, 10000)

# Display the details
student.display()
faculty.display()

This code first creates a base class Person with attributes name, age, and address and a method display() to display these details. Then it creates a subclass Student with additional attributes rollno, mark1, mark2, and mark3. The display() method is overridden in Student to display the student details and calculate the grade based on the marks. Another subclass Faculty is created with additional attributes faculty_id, department, basic_pay, and DA. The display() method is overridden in Faculty to display the faculty details and calculate the total salary. Finally, instances of Student and Faculty are created and their details are displayed.