A and B invests Rs.3000 and Rs.7000 respectively in a business. If A doubles his capital after 6 months. In what ratio should A and B divide that year's profit? Choose the correct choice from the following answers:
A) 9 : 6	B) 9 : 8	C) 9 : 14	D) 9 : 9	E) 9 : 5

Rationale: "( 3 * 6 + 6 * 6 ) : ( 7 * 12 ) 54 : 84 = > 9 : 14 . answer : c"
Answer: C