One common system for computing a grade point average (gpa) assigns 4 points to an a, 3 points to a b, 2 points to a c, 1 point to a d, and 0 points to an f. what is the gpa of a student who gets an a in a 3-credit course, a b in each of three 2-credit courses, a c in a 4-credit course, and a d in a 3-credit course?