A starts business with Rs.3500 and after 10 months, B joins with A as his partner. After a year, the profit is divided in the ratio 2 : 3. What is Bâ€™s contribution in the Capital ?	Choices:  A) 24887  B) 20778  C) 23788  D) 31500  E) 2811

Rationale: "explanation : a invested rs . 3500 for 12 months . let b joined with investment x . and he invested for 12 - 10 = 2 months . so there profit ratio = ( 3500 ã — 12 ) : ( 2 x ) = 2 : 3 â ‡ ’ x = 31500 answer : d"
Answer: D