Susan has just completed her second semester in college. She earned a grade of D in her 2-hour discrete math course, a grade of D in her 1-hour psychology course, a grade of B in her 5-hour physics course, and a grade of B in her 1-hour philosophy course. Assuming that A equals 4 points, B equals 3 points, C equals 2 points, D equals 1 point, and F is worth no points, determine Susan's grade-point average for the semester. Susan's grade point average is (Round to two decimal places as needed.) S