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  • Question
  • A sum of Rs. 725 is lent in the beginning of a year at a certain rate of interest. After 8 months, a sum of Rs. 362.50 more is lent but at the rate twice the former. At the end of the year, Rs. 33.50 is earned as interest from both the loans. What was the original rate of interest?


  • Options
  • A. 3.6%
  • B. 4.5%
  • C. 5%
  • D. 6%
  • E. None of these

  • Correct Answer
  • None of these 

    Explanation
    Let the original rate be R%. Then, new rate = (2R)%.

    Note:
    Here, original rate is for 1 year(s); the new rate is for only 4 months i.e. ⅓ year(s).

    725 x R x 1 + 362.50 x 2R x 1 = 33.50
    100 100 x 3

    ⟹ (2175 + 725) R = 33.50 x 100 x 3

    ⟹ (2175 + 725) R = 10050

    ⟹ (2900)R = 10050

    ⟹ R = 10050 = 3.46
    2900

    ∴ Original rate = 3.46%


  • More questions

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    • Options
    • A. 30 min.
    • B. 33 min.
    • C. 371 / 2 min.
    • D. 45 min.
    • Discuss
    • 2. 
      Two vessels A and B contain milk and water in the ratio 7 : 5 and 17 : 7 respectively. In what ratio mixtures from two vessels should be mixed to get a new mixture containing milk and water in the ratio 5 : 3?

    • Options
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    • 3. 
      A shopkeeper buys 26 liter of milk @ Rs. 16 per liter. He also buys from another source an inferior quality of milk @ Rs. 10 per liter. How much quantity of the later should he buy to mix it with the former so that he can sell the mixture @ Rs. 14 per liter without making any loss?

    • Options
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    • 4. 
      The sum of two number is 216 and their H.C.F is 27. The numbers are?

    • Options
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    • 5. 
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    • Options
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    • 6. 
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    • Options
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    • 10. 
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