The average of the marks of 10 students in a class is 80. If the marks of each student are doubled, find the new average?	Choose one
A) 80  B) 120  C) 160  D) 270  E) 110

Rationale: "sum of the marks for the 10 students = 10 * 80 = 800 . the marks of each student are doubled , the sum also will be doubled . the new sum = 800 * 2 = 1600 . so , the new average = 1600 / 10 = 160 . answer : c"
Answer: C