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.21000. A's share is? Choose one:	A) s.7000	B) s.7200	C) s.6000	D) s.5750	E) s.6750
x* 12 : 2x* 6: 3x* 4   1:1:1   1/3 * 21000= 
<gadget id="calculator">1/3 * 21000</gadget>
<output>7_000</output>
7000   s.7000NSWER:s.7000
<result>A</result>
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.21000. A's share is?