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?
Choose the correct choice from the following.
A) rs 840
B) rs 1320
C) rs 1620
D) rs 1680
E) none of these

Rationale: "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 : c"
Answer: C