6. Mr. Chamod is given with following investment opportunities. Rs. 2000 at the end of each year for the first 5 years plus Rs. 3000 at the end of each year from years 6 to 9 plus Rs. 5000 at the end of each year from years 10 to 15. How much Mr. Chamod is willing to pay for this investment? And what will be the answer if payments are received at the beginning of each year?