Write a user-defined function that calculates grade point average (GPA) on a scale of 0 to 4, where A = 4, A- = 3.7, B+ = 3.3, B = 3, B- = 2.7, C+ = 2.3, C = 2, C- = 1.7, D+ = 1.3 D = 1, and E = 0. For the function name and arguments, use av = GPA ( g 1 h). The input argument g is a vector whose elements are the numerical values of the grades. The input argument h is a vector with the corresponding credit hours. The output argument avis the calculated GPA. Use the function to calculate the GPA for a student with the following record:

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Grade A- Credit Hours 43323 433