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46. A sum of money lent out at SI amount to Rs.7000 after 2 years and Rs.14000 after a further period of 5yrs. Find the principal?

47. 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?

49. The banker's gain of a certain sum due 2 years hence at 10% per annum is Rs.24. The present worth is?