If 4 men working 10 hours a day earn Rs. 1400 per week, then 9 men working 6 hours a day will earn how much per week?	Choose the correct choice from the following options:
A) Rs 840 B) Rs 1320 C) Rs 1620 D) Rs 1890 E) None of these
Explanation :   (Men 4:9) : (Hrs/Rs 1890ay 10:6) :: 1400 : x   hence 4 * 10 *x = 9 * 6 * 1400   or x = 9*6*1400/ 4*10 = 1890   Answer : Rs 1890
<result>D</result>
If 4 men working 10 hours a day earn Rs. 1400 per week, then 9 men working 6 hours a day will earn how much per week?