51. A certain sum doubles in 7 years at simple interest. The same sum under the same interest rate will become 4 times in how many years = ?
52. On a certain sum the simple interest for $$12\frac{1}{2}$$ year is $$\frac{3}{4}$$ of the sum. Then the rate of interest is = ?
53. If the simple interest on Rs. 1 for 1 month is 1 paisa, then the rate percent per annum will be = ?
54. A person invests money in three different schemes for 6 years, 10 years and 12 years at 10 percent, 12 percent and 15 percent simple interest respectively. At the completion of each scheme, he gets the same interest. The ratio of his investment is
55. A man invested $$\frac{{\text{1}}}{{\text{3}}}$$ of his capital at 7%; $$\frac{{\text{1}}}{{\text{4}}}$$ at 8% and the remainder at 10%. If his annual income is Rs. 561, the capital is -
56. Find the amount to be received after 2 years 6 months at the rate of 5% p.a. of simple interest on a sum of Rs. 3200.
57. The simple interest on a certain sum of money at the rate of 5% per annum for 8 years is Rs. 840. Rate of interest for which the same amount of interest can be received on the same sum after 5 years is = ?
58. If a sum of money double itself in 8 years, then the interest rate in percentage is ?
59. Alipta got some amount of money from her father. In how many years will the ratio of the money and the interest obtained from it be 10 : 3 at 6% simple interest per annum ?
60. A sum of Rs. 3000 yields an interest of Rs. 1080 at 12% per annum simple interest in how many years ?
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