If 4 men working 10 hours a day earn Rs. 600 per week, then 9 men working 6 hours a day will earn how much per week?	Answers.
A) Rs 840	B) Rs 320	C) Rs 810	D) Rs 680	E) None of these
Explanation :   (Men 4:9) : (Hrs/Day 10:6) :: 600 : x   hence 4 * 10 *x = 9 * 6 * 600   or x = 9*6*600/ 4*10 = 810   Answer : Rs 810
<result>C</result>
If 4 men working 10 hours a day earn Rs. 600 per week, then 9 men working 6 hours a day will earn how much per week?