NEED THIS SOLVED IN PYTHON

4. Develop a GPA Calculator in Python. The features that you need to include are: a. The student will input the letter grade and units (credit hours) for 3 courses b. The output should be the student GPA, based on his/her performance in the courses cif student GPA is below 2.2, show a message indicating that "Student is on Probation d. If student GPA is above 3.6, show a message indicating that "Student is on the Merit List" Extra checks: make sure the letter grade is correct ('A', 'B', 'C', 'D' or 'F'), also accept the same letters in small case (eg, 'a', 'b', 'c','d', ort) If the letter grade is incorrect, show an error message, and make the program exit without calculating the GPA the grade points for each grade are as follows: Grade A B D F Grade Points 4.0 3.0 2.0 1.0 0.0 An example of possible input and the expected output (round off to 2 decimal places): Enter the letter grade for course 1: A Enter the credit hours for course 1:3 Enter the letter grade for course 2: C Enter the credit hours for course 2:4 Enter the letter grade for course 1: B Enter the credit hours for course 1:4 Student GPA is: 2.91 Note: I have highlighted the possible input values by a user in yellow. Of course, we need to program for any possible choice of letter grades and credit hours. We expect credit hours to be an integer value (le, a whole number). (20 marks)