If 4 men working 10 hours a day earn Rs. 1000 per week, then 9 men working 6 hours a day will earn how much per week? Choose the correct choice from the following answers.
A) Rs 840	B) Rs 1350	C) Rs 1620	D) Rs 1680	E) None of these
Explanation :   (Men 4:9) : (Hrs/Day 10:6) :: 1000 : x   hence 4 * 10 *x = 9 * 6 * 1000   or x = 9*6*1000/ 4*10 = 1350   Answer : Rs 1350
<result>B</result>
If 4 men working 10 hours a day earn Rs. 1000 per week, then 9 men working 6 hours a day will earn how much per week?