John,David and Xavier enter into partnership. John invests some money at the beginning, David invests double the amount after 6 months, and Xavier invests thrice the amount after 8 months. If the annual gain be Rs.24000. John's share is?
Options.
A) 7500  B) 7250  C) 8000  D) 8200  E) 8100
x* 12 : 2x* 6: 3x* 4   1:1:1   1/3 * 24000= 
<gadget id="calculator">1/3 * 24000</gadget>
<output>8_000</output>
8000   Answer: 8000
<result>C</result>
John,David and Xavier enter into partnership. John invests some money at the beginning, David invests double the amount after 6 months, and Xavier invests thrice the amount after 8 months. If the annual gain be Rs.24000. John's share is?