P,Q and R enter into a partnership in the ratio 7/2 : 4/3 : 6/5. After 4 months, A increases his share by 50%. If the total profit at the end of one year be Rs.21600, then B’s share in the profit is:	Choose the correct choice from the following answers.
A) Rs.2100 B) Rs 2400 C) Rs.3600 D) Rs.4000 E) Rs.3000
Ratio of initial investments = 105 : 40 : 36.   Let the initial investments be 105x, 40x &amp; 36x.   Therefore, P : Q : R = 105x * 4 + 150/100 x 105x * 8 : 40x * 12 : 36x * 12   = 1680x : 480x : 432x = 35 : 10 : 9.   Therefore, Q’s share = Rs. 21600 * 10/54   = Rs.4000.   ANSWER:Rs.4000
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P,Q and R enter into a partnership in the ratio 7/2 : 4/3 : 6/5. After 4 months, A increases his share by 50%. If the total profit at the end of one year be Rs.21600, then B’s share in the profit is: