(Questions 20-24): The following pie-charts show the distribution of students of graduate and post-graduate levels in 7 different Institutes : `M ,\ N ,\ P ,\ Q ,\ R ,\ S` and `T` in a town. Study the pie-charts carefully and answer the questions given below: Distribution of students at graduate and post-graduate levels in seven institutes `m ,\ n ,\ p ,\ q ,\ r ,\ s` and `t` Total Number of Students of Graduate Level = 27300 (FIGURE) Total Number of Students of Post-Graduate Level = 24700 (FIGURE) How many students of institutes `M` and `S` are studying at graduate level? (a) 7516 (b) 8463 (c) 9127 (d) 9404