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      Question

      The simple interest on a sum of Rs. (6400 + x) invested

      for 3 years is Rs. 4,800. If the interest rate is 12.5% per annum, find the value of x.
      A 5500 Correct Answer Incorrect Answer
      B 6400 Correct Answer Incorrect Answer
      C 6000 Correct Answer Incorrect Answer
      D 7200 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Simple interest = Sum ├Ч rate of interest ├Ч time period ├╖ 100 ATQ; 4800 = (6400 + x) ├Ч 12.5 ├Ч 3 ├╖ 100 Or, 4800 = (6400 + x) ├Ч 0.375 Now divide: 4800 ├╖ 0.375 = 6400 + x 12800 = 6400 + x So, x = 6400

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