81. A borrows a sum of Rs. 90,000 for 4 years at 5% simple interest. He lends it to B at 7% for 4 years at simple interest. What is his gain (in Rs.)?
82. A person borrowed 2,000 at 5% annual simple interest repayable in 3 equal annual installments. What will be the annual installment?
83. A milkman borrowed a sum of Rs. 2,500 from two money lenders for one loan on simple interest at the rate of 5% and 7%, respectively, for a period of 2 years. If the total interest paid by him was Rs. 276, then how much did he borrow at the rate of 7% p.a.?
84. A sum of Rs. 12,800 is invested separately at 15% per annum and the remaining at 12% per annum simple interest. If the total interest at the end of 3 years is Rs. 5,085, then how much money was invested at 15% per annum?
85. A Sum of Rs. 10,500 amounts to Rs. 13,825 in $$3\frac{4}{5}$$ years at a certain rate percent per annum simple interest. What will be the simple interest on the same sum for 5 years at double the earlier rate?
86. A man has Rs. 10,000. He lent a part of it at 15% simple interest and the remaining at 10% simple interest. The total Interest he received after 5 years amount to Rs. 6,500. The difference between the parts of
the amounts he lent is:
87. Simple interest on a certain sum one-fourth of the sum and the interest rate percentage per annum is 4 times the numbers of years. If the rate of interest increases by 2%, then what will be the simple interest (in Rs.) on Rs. 5,000 for 3 years?
88. In a certain duration of time, a sum become 2 times itself at the rate of 5% per annum simple interest. What will be the rate of interest if the same sum becomes 5 times itself in the same duration?
89. A car with a price of Rs. 6,50,000 is bought by making some down payment. On the balance, a simple interest of 10% is charged in lump sum and the money is to be paid in 20 equal annual instalments of Rs. 25,000. How much is the down payment?
90. Brajesh had Rs. 8,600 which he invested in two parts. Simple interest received on the first part at 15% p.a. in 4 years is equal to the simple interest received on the second part at 20% p.a. in 3 years. Find the difference in the two parts.
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