The average of the marks of 12 students in a class is 50. If the marks of each student are doubled, find the new average?
Options:	A) 160	B) 120	C) 100	D) 150	E) 170

Rationale: "sum of the marks for the 12 students = 12 * 50 = 600 . the marks of each student are doubled , the sum also will be doubled . the new sum = 600 * 2 = 1200 . so , the new average = 1200 / 12 = 100 . answer : c"
Answer: C