A and B invests Rs.2500 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 choice from the following options.
A) 11 : 5
B) 15 : 16
C) 15 : 2
D) 9 : 9
E) 11 : 1

Rationale: "( 2.5 * 6 + 5 * 6 ) : ( 4 * 12 ) 45 : 48 = > 15 : 16 answer : b"
Answer: B