A and B invests Rs.3000 and Rs.8000 respectively in a business. If A doubles his capital after 6 months. In what ratio should A and B divide that year's profit?
Pick one.
A) 9 : 6
B) 9 : 8
C) 9 : 16
D) 9 : 9
E) 9 : 5

Rationale: "( 3 * 6 + 6 * 6 ) : ( 8 * 12 ) 54 : 96 = > 9 : 16 . answer : c"
Answer: C