91. The simple interest on a sum of money is $$\frac{1}{4}$$ of the principal and the number of years is equal to rate percent per annum. The rate percent is = ?
92. A lent Rs. 5000 to B for 2 years and Rs. 3000 to C for 4 years on simple interest at the same rate of interest and received Rs. 2200 in all from both as interest. The rate of interest per annum is = ?
93. What annual installment will discharge a debt of Rs. 6450 due in 4 years at 5% simple interest = ?
94. A sum of money lent out at simple interest amounts to Rs. 720 after 2 years and to Rs.1020 after a further period of 5 years. The sum is
95. A sum of money becomes Rs. 20925 in 2 years and Rs. 24412.50 in 5 years. Find the rate of interest and the sum of money.
96. In how many years will a sum of money double itself at 18.75% per annum simple interest?
97. In how many years will the simple interest on a sum of money be equal to the principal at the rate of $$16\frac{2}{3}$$ % per annum ?
98. A sum of money was invested at a certain rate of simple interest for 2 years. Had it been invested at 1% higher rate, it would have fetched Rs. 24 more interest. The sum of money is ?
99. A man invests half of his capital at the rate of 10% per annum, one - third at 9% and the rest at 12% per annum. The average rate of interest per annum, which he gets is = ?
100. A sum of money at simple interest doubles in 7 years. It will become four times in:
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