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16. If the difference between CI and SI earned on a certain amount at 15% pa at the end of 3 years is Rs.3200, find out the principal?

17. A lent 2000rs to B at 8% annual rate of interest and some amount to C at same rate of interest for same period of time. If after 5 years, A got a total of 1500 rupee as interest. Find the sum lent to C?

18. A sum of 8000 rupees is divided between two people A and B at the rate of interest of 4% and 5% respectively. The total interest earned after 2 years is equal to 750. Then find the ratio of investment between A and B?

19. Priya borrows 1000 rupees at the rate of 11% per annum on SI and rahul borrows 780 rupees at the rate of 15% per annum on SI. In how many years will the amount of debt of priya and rahul be equal?