A, B and C enter into partnership. A invests some money at the beginning, B invests double the amount after 6 months, and C invests thrice the amount after 8 months. If the annual gain be Rs.18000. A’s share is?

A. Rs.7500
B. Rs.7200
C. Rs.6000
D. Rs.5750

Explanation:

x* 12 : 2x* 6: 3x* 4

1:1:1

1/3 * 18000 = 6000