the average earning of a person for the first 4 days of a week is rs 18 and for the last 4 days is rs 22 . if he earns rs 20 on the fourth day , his average earning for the whole week is ?	Choose the correct choice from the following options:
A) rs 18.95	B) rs 16	C) rs 20	D) rs 25.71	E) none of these

Rationale: total earning for the week = rs ( 4 × 18 + 4 × 22 - 20 ) = rs 140 average earning = rs 140 / 7 = rs 20 . answer : c
Answer: C