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26. A certain amount of simple interest of Rs. 2500 after 5 years. Had the interest increased 2% more,what is SI now?(Assume P= 10,000)?

27. A sum of money trebles itself in 16 years.In how many years it would become double itself in how many years?

28. Rs 6200 is lent in two parts , one part at 6% for 5 years and second part at 8% for 4 years. After 5 years and 4 years respectively, the interests received from both parts is same. Find the amount lend at 6%?

29. The true discount on a bill of Rs.540 is Rs.90. The banker's discount is?

30. A man took a certain sum as loan from bank at a rate of 9% SI per annum. The man lends the same amount to another person at 15% SI per annum. If at the end of 4 years man made a profit of Rs. 9000 from the deal. What was the original sum?