An amount of money is to be divided between P, Q and R in the ratio of 3:7:12. If the difference between the shares of P and Q is Rs.2400, what will be the difference between Q and R's share?  Pick.
A) 1266	B) 3000	C) 2866	D) 2999	E) 2678

Rationale: "4 - - - 2000 5 - - - ? = > 3000 answer : b :"
Answer: B