A and B invests Rs.4000 and Rs.4000 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 answer
A) 3 : 5 B) 3 : 8 C) 3 : 2 D) 9 : 9 E) 3 : 1

Rationale: "( 4 * 6 + 8 * 6 ) : ( 4 * 12 ) 72 : 48 = > 3 : 2 answer : c"
Answer: C