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681 . The difference between simple and compound interest on a sum of money at 20% per annum for 3 years is Rs. 48. What is the sum?
A. Rs. 550 B. Rs. 500
C. Rs. 375 D. Rs. 400

682 . In what time will the simple interest on Rs. 1750 at 9% per annum be the same as that on Rs. 2500 at 10.5% per annum in 4 years?
A. 6 years and 8 months B. 7 years and 3 months
C. 6 years D. 7 years and 6 months

683 . Raju lent Rs. 400 to Ajay for 2 years and Rs. 100 to Manoj for 4 years and received together from both Rs. 60 as interest. Find the rate of interest, simple interest being calculated.
A. 5% B. 6%
C. 8% D.
9%

684 . A sum becomes 4 times at simple interest in 10 years. What is the rate of interest?
A. 10% B. 20%
C. 30% D. 40%

685 . A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to 8 times?
A. 9 years B. 8 years
C. 27 years D. 12 years




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