If 4 men working 10 hours a day earn Rs. 1200 per week, then 9 men working 6 hours a day will earn how much per week?	Pick one:
A) Rs 840	B) Rs 1320	C) Rs 1620	D) Rs 1680	E) None of these
Explanation :   (Men 4:9) : (Hrs/Day 10:6) :: 1200 : x   hence 4 * 10 *x = 9 * 6 * 1200   or x = 9*6*1200/ 4*10 = 1620   Answer : Rs 1620
<result>C</result>
If 4 men working 10 hours a day earn Rs. 1200 per week, then 9 men working 6 hours a day will earn how much per week?