A student taking DS 412, thinking the class did not seem to be so challenging, performed poorly in some of the first few quizzes and ended up earning an average of only 50% on quizzes overall. Subsequently, he blew off the first midterm and earned 60%. After a delayed wake-up call, this student managed to get a 72% on the second midterm. What is the minimum score that he should obtain on the cumulative final exam to pass the class? NOTE 1: The weight for the quizzes, midterm 1, midterm2, and the final exam are respectively, 20%, 25%, 25%, 30%. NOTE 2: Assume there is no curve applied and an overall score of 70% is needed to obtain a “C-“ which is the lowest passing grade.