The average of the marks of 12 students in a class is 36. If the marks of each student are doubled, find the new average?	Choose the correct answer.
A) 72	B) 23	C) 29	D) 26	E) 13

Rationale: "sum of the marks for the 12 students = 12 * 36 = 432 . the marks of each student are doubled , the sum also will be doubled . the new sum = 432 * 2 = 864 . so , the new average = 864 / 12 = 72 . answer : a"
Answer: A