61. At what rate percent per annum of compound interest, will a sum of money become four times of itself in two years ?
62. On a certain sum of money, the difference between the compound interest for a year, payable half yearly, and the simple interest for a year is Rs. 56. If the rate of interest in both the cases is 16%, then the sum is ?
63. On a certain sum of money, the difference between the compound interest for a year payable half yearly, and the simple interest for a year is Rs. 180. If the rate of interest in both the cases is 10%, then the sum is = ?
64. The compound interest accrued on an amount of Rs. 25500 at the end of 3 years is Rs. 8440.50. What would be the simple interest accrued on the same amount at the same rate in the same period ?
65. The difference between the amount of compound interest and simple interest accrued on an amount of Rs. 26000 at the end of 3 years is Rs. 2994.134. What is the rate of interest p.c.p.a ?
66. A sum of money becomes eight times in 3 years, If the rate is compounded annually. In how much time will the same amount at the same compound rate become sixteen times ?
67. A sum of money placed at compound interest double itself in 4 years. In how many years will it amount to four times itself ?
68. The compound interest on Rs. 30000 at 7% per annum for a certain time is Rs. 4347. The times is = ?
69. A money lender borrows money at 4% per annum and pays the interest at the end of the year. He lends it at 6% per annum compound interest compounded half yearly and receives the interest at the end of the year. In this way, he gains Rs. 104.50, a year. The amount of money be borrows, is ?
70. The effective annual rate of interest corresponding to a nominal rate of 6% per annum payable half yearly is = ?
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