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27. 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?

28. A Principal amount give Rs.12750 as SI for 7 years at the rate of 10% to get the same amount of interest of 10 years, what will be the rate of interest?

29. A certain sum of money at certain rate of interest becomes Rs 3420 after 2 years and at same rate after two and a half years becomes Rs 3525. Find the rate percent per annum?