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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