A invested Rs 6000 in a business and after 4 months, B joined him with Rs. X more amount than A. At the end of a year, the total profit of the business is Rs. 4400 and the profit share of A is Rs. 2400. Find the investment of B (in Rs.)?

Correct option is B

Capital of B = 6000+X Rs.
Profit ratio of A to that of B = 6000 ×12 : (6000+X)×8
18000 : 12000+2X
ATQ, $$\frac{18000}{12000 + 2X} = \frac{2400}{4400 - 2400}$$​
15000 = 12000 + 2X
X = 1500
So, investment of B = 6000+1500 = 7500 Rs.