The average earning of a person for the first four days of a week is Rs 18 and for the last four days is Rs 22. If he earns Rs 20 on the fourth day, his average earning for the whole week is?  Options.
A) Rs 18.95
B) Rs 16
C) Rs 20
D) Rs 25.71
E) None of these
Total earning for the week   = Rs (4 × 18 + 4 × 22 - 20) = Rs 140   Average earning = Rs 140/7= 
<gadget id="calculator">140/7</gadget>
<output>20</output>
Rs 20.   ANSWER:Rs 20
<result>C</result>
The average earning of a person for the first four days of a week is Rs 18 and for the last four days is Rs 22. If he earns Rs 20 on the fourth day, his average earning for the whole week is?