A1, A2 and A3 enter into a partnership in the ratio 7/2 : 4/3 : 6/5 . After 4 months, A1 increases his share 50%. If the total profit at the end of one year be Rs. 21,600, then A2's share in the profit is: Pick one:
A) 3000
B) 3200
C) 3450
D) 4000
E) 3570
Ratio of initial investments = 7/2 : 4/3 : 6/5   = 105 : 40 : 36.   Let the initial investments be 105x, 40x and 36x.   =&gt; A1 : A2 : A3 = 105x x 4 + 150/100 x 105x x 8 : (40x x 12) : (36x x 12)   = 1680x : 480x : 432x   = 35 : 10 : 9.   Hence, A2's share = Rs. 21600 x 10/54   = Rs. 4000. Answer : 4000
<result>D</result>
A1, A2 and A3 enter into a partnership in the ratio 7/2 : 4/3 : 6/5 . After 4 months, A1 increases his share 50%. If the total profit at the end of one year be Rs. 21,600, then A2's share in the profit is: