A, B and C enter into a partnership in the ratio 7/2:4/3:6/5.After 4 months, A increases his share 50%. If the total profit at the end of one year be Rs. 21,600, then B's share in the profit is:  Choose the most appropriate option:
A) Rs. 2100 B) Rs. 2400 C) Rs. 3600 D) Rs. 4000 E) Rs. 3800
Explanation:   Ratio of initial investments =(7/2:4/3:6/5)=105 : 40 : 36.   Let the initial investments be 105x, 40x and 36x.   A : B : C =(105 X4+150/100X105X8):(40X X 12):(36x x 12)   = 1680x : 480x : 432x = 35 : 10 : 9.   Hence, B's share = Rs.(21600 X 10/54)=Rs. 4000.   ANSWER IS Rs. 4000
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A, B and C enter into a partnership in the ratio 7/2:4/3:6/5.After 4 months, A increases his share 50%. If the total profit at the end of one year be Rs. 21,600, then B's share in the profit is: