3- Write a user-defined function that calculates grade point average (GPA) on a scale of 0 to 4, where A 4, A3.7, B+-33, B 3, B2.7, C+-2.3, c-2,C--1.7 , D+-1.3 D-1,and E-OFor the function name and arguments, use av GPA (g, 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 av is the calculated GPA. Use the function to calculate the GPA for a student with the following record: Grade IA_ | B | B+ | C | E | A |D+ Credit Hours 43323 433