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41. A sum of Rs.12,500 to Rs.15,000 in 2 years,find the rate of interest?

42. The present worth of a certain sum due sometime hence is Rs.1600 and the true discount is Rs.160. The banker's gain is?

43. The present worth of a certain bill due sometime hence is Rs.800 and the true discount is Rs.36. The banker's discount is?

44. A sum was put at S.I. at certain rate for 4 years. Had it been put at 6% higher rate, it would have fetched Rs.800 more. Find the sum?

45. 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?