Examination Questions on Simple and Compound InterestAmount = Principle + InterestSimple Interest = (Principle x Rate of Interest X Time period)/100Compound Interest = Principle(1 + r/100)n – Principle r = rate of interest and n = time period Show
1. A sum of money becomes 3 times in 5 years. In how many years will the same sum become 6 times at the same rate of simple interest?
2. What is the compound interest on Rs. 1600 at 25% per annum for 2 years compounded annually?
3. A certain sum at simple interest amounts to Rs. 1350 in 5 years and to Rs. 1620 in 8 years. What is the sum?
4. The sum which amounts to Rs. 364.80 in 8 years at 3.5% simple interest per annum is:
5. What is the least number of complete years in which a sum of money at 20% compound interest will be more than doubled?
6. A sum of money on compound interest amounts to Rs. 9,680 in 2 years and to Rs. 10,648 in 3 years. What is the rate of interest per annum?
7. A sum of money lent on simple interest trebles itself in 15 years and 6 months. In how many years will it be doubled?
8. The simple interest on a certain sum of money for 3 years at 8% per annum is half the compound interest on Rs. 4,000 for 2 years at 10% per annum. What is the sum placed on simple interest?
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At what rate per cent compound interest does a sum of money becomes 1.44 times of itself in 2 years?Detailed Solution
A sum becomes 1.44 times of itself. ∴ The rate of interest is 20%.
At what rate percent compound interest does a sum of money becomes 27 times in 3 years?The rate of interest per annum is 200 %.
At what rate percent compound interest does a sum of money becomes 9 times in 2 years?Detailed Solution
The sum becomes 9 times in 2 years. Calculation: Let the principal be 'P'. ∴ The rate of interest is 200%.
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