The average earning of a mechanic for the first-four days of a week is Rs. 18 and for the last four days is Rs. 22. If he earns Rs . 41 on the fourth day, his average earning for the whole week is ? Select the correct option.
A) Rs . 18.95  B) Rs 16  C) Rs. 17  D) Rs. 25.71  E) None of these
Answer   Total earning for the week = Sum of earning of first four days + Sum of earning of last four days - Earning of 4th day   = 4 x18 + 4 x 22 -41   = Rs. 119   âˆ´ Average earning = 119 / 7   = Rs. 17   Rs. 17orrect Option: Rs. 17
<result>C</result>
The average earning of a mechanic for the first-four days of a week is Rs. 18 and for the last four days is Rs. 22. If he earns Rs . 41 on the fourth day, his average earning for the whole week is ?