A and B invests Rs.3000 and Rs.10000 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 one
A) 9 : 6	B) 9 : 8	C) 9 : 20	D) 9 : 9	E) 9 : 5

Rationale: "( 3 * 6 + 6 * 6 ) : ( 10 * 12 ) 54 : 120 = > 9 : 20 . answer : c"
Answer: C