Kiran received Rs. 6000 as his share out of the total profit of Rs.9000 which he and Arun earned at the end of one year. If Kiran invested Rs. 30,000 for 6 months, whereas Arun invested his amount for the whole year, what was the amount invested by Arun?	Choose the correct choice from the following answers:
A) Rs.5000  B) Rs.6000  C) Rs.7000  D) Rs.7500  E) Rs.6500
Suppose Arun invested Rs.x. Then, Kiran : Arun = (30000 * 6) : (x * 12)   Therefore, 180000/ 12x = 6000/3000   or x = 18000/24   = 7500.   ANSWER:Rs.7500
<result>D</result>
Kiran received Rs. 6000 as his share out of the total profit of Rs.9000 which he and Arun earned at the end of one year. If Kiran invested Rs. 30,000 for 6 months, whereas Arun invested his amount for the whole year, what was the amount invested by Arun?