The average earning of amechanic for the first 4days of a week is Rs.25 and for the last four days is Rs.22. If heearns Rs.20 on the fourth day, his average earning forthe whole week is?  Choices
A) s. 10	B) s. 24	C) s. 30	D) s. 40	E) s. 50
Total earning for the week = Sum of earning of first four days + Sum of earning of last four days - Earning of 4th day   = 4 x 25+ 4 x 22 -20   = Rs. 168   âˆ´ Average earning = 168/ 7   = Rs. 24   s. 24
<result>B</result>
The average earning of amechanic for the first 4days of a week is Rs.25 and for the last four days is Rs.22. If heearns Rs.20 on the fourth day, his average earning forthe whole week is?