In a school the periodical examination are held every second month. In a session during April 2001 - March 2002, a student of Class IX appeared for each of the periodical exams. The aggregate marks obtained by him in each periodical exam are represented in the line-graph given below.What is the percentage of marks obtained by the student in the periodical exams of August, 01 and Oct, 01 taken together ?

In a school the periodical examination are held every second month. In

1.	In a school the periodical examination are held every second month. In a session during April 2001 - March 2002, a student of Class IX appeared for each of the periodical exams. The aggregate marks obtained by him in each periodical exam are represented in the line-graph given below.What is the percentage of marks obtained by the student in the periodical exams of August, 01 and Oct, 01 taken together ?
A.	73.25%
B.	75.5%
C.	77%
D.	78.75%
Answer» C. 77%