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      Question

      Priya had Rs. 3000 with her. She invested Rs. β€˜y’ at

      15% p.a. simple interest for 4 years and the remaining sum at 40% p.a. compound interest, compounded annually for 3 years. If the total interest received by her is Rs. 2700, then find the value of β€˜y’.
      A 4025 Correct Answer Incorrect Answer
      B 5025 Correct Answer Incorrect Answer
      C 6025 Correct Answer Incorrect Answer
      D 4250 Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Simple interest received by Priya = (y Γ— 15 Γ— 4)/100 = Rs. 0.6y Compound interest received by Priya = (3000 – y)(1 + 40/100)Β³ – (3000 – y) = Rs. 1.728(3000 – y) - (3000 - y) = Rs. 0.728(3000 - y) According to the question, 0.6y + 0.728(3000 – y) = 2700 Or, 0.6y + 2184 - 0.728y = 2700 Or, 2184 - 0.128y = 2700 Or, -0.128y = 2700 - 2184 Or, -0.128y = 516 Or, y = 516 / 0.128 = 4025

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