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Problems on Compound Interest

Q11. If the rate of interest be 3% per annum for the first year, 4% per annum for second year and 5% per annum for third year, then the compound interest of Rs. 10,000 for 3 years will be
(a) 1029.66
(b) 1124.53
(c) 1156.89
(d) 1247.60

Q12. A sum of money ammounts to Rs. 7690 after 3 years and to Rs. 11035 after 6 years on compound interest. The sum is
(a) 1425.66
(b) 5142.78
(c) 5358.95
(d) 6825.14

Q13. The compound interest on Rs. 16000 for 9 months at 20% per annum compounded quaterly is
(a) 2522
(b) 2599
(c) 2677
(d) 2682

Q14. At what rate of interest will Rs. 10,000 become Rs. 12100 after 2 years when interest is compounded annually ?
(a) 8%
(b) 10%
(c) 13%
(d) 15%

Q15. A money-lender borrows money at 4% per annum and pays interest at the end of the year. He lends it at 6% per annum compound interest compounded half yearly and receives the interest at the end of the year. Thus he gains Rs. 104.50 a year. The amount of money he borrows is
(a) 4000
(b) 5000
(c) 6000
(d) 7000

Q16. The difference between compound interest and simple interest on a sum for 3 years at 5% per annum is Rs. 768. The sum is
(a) 75581
(b) 92564
(c) 95863
(d) 100721

Q17. If the compound interest on a certain sum of money for 2 years at 10% per annum is Rs. 840, what would be the simple interest ?
(a) 580
(b) 600
(c) 720
(d) 800

Q18. A deposited Rs. 6000 in a bank at 5% per annum simple interest. B deposited Rs. 5000 at 8% per annum compound interest. After 2 years, the difference between their interest will be
(a) 232
(b) 256
(c) 298
(d) 318

Q19. The compound interest on Rs. 2600 for 1½ years at 10% per annum is
(a) 390
(b) 403
(c) 483
(d) 513

Q20. Find the compound interest on Rs. 40,000 at 15% per annum for 6 months compounded quaterly
(a) 3900
(b) 4100
(c) 4300
(d) 5100


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