West Bengal Police Constable Special Mock Test
Mathematics - Mixed Interest
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1) A sum of money becomes Rs. 6400 in 2 years and Rs. 7392 in 3 years at compound interest. What is the rate of interest?
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2) A sum of ₹4,800 is invested in a savings scheme which offers 15% per annum compound interest, compounded annually. What will be the amount after 2 years?
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3) A person invested ₹8,000 in a business that offers 10% compound interest per annum. What will be the total amount after 3 years?
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4) Which investment option is better if bank A offers 10% simple interest for 3 years and bank B offers 8% compound interest for the same period?
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5) A borrower has to pay Rs. 1260 after 3 years at a simple interest rate of 7% per annum. What was the sum borrowed?
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6) A sum of ₹3,500 amounts to ₹4,284 in 2 years at a certain rate of compound interest. What is the rate of interest?
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7) The compound interest on a certain sum of money for 2 years is Rs. 410, and the simple interest for the same period is Rs. 400. What is the principal amount?
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8) A sum becomes ₹1,728 in 2 years and ₹1,944 in 3 years at compound interest. What is the rate of interest?
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9) A sum of money is invested at compound interest, which grows to Rs. 10,000 in 2 years and to Rs. 15,000 in 4 years. What is the annual rate of interest?
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10) A person invests Rs. 20,000 in a bank at a simple interest rate of 5% per annum. How much interest will he earn in 3 years?
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