The average marks of 20 students in a class is 100. But a student mark is wrongly noted as 50 instead of 10 then find the correct average marks?	Choose the correct choice from the following:
A) 78	B) 82	C) 98	D) 91	E) 85

Rationale: "correct avg marks = 100 + ( 10 - 50 ) / 20 avg = 100 - 2 = 98 answer is c"
Answer: C