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      Question

      A man invested certain sum at simple interest of r% p.a.

      such that it amounts to 160% of itself in 6 years. Find the interest earned when Rs. 2400 is invested at simple interest of r% p.a. for 3 years.
      A Rs. 720 Correct Answer Incorrect Answer
      B Rs. 600 Correct Answer Incorrect Answer
      C Rs. 620 Correct Answer Incorrect Answer
      D Rs. 630 Correct Answer Incorrect Answer

      Solution

      Let the sum invested be Rs. β€˜P’ Therefore, interest earned in 6 years = 1.6P – P = Rs. 0.6P ATQ; 0.6P = (P Γ— r Γ— 6) Γ· 100 Or, r = 60 Γ· 6 Or, r = 10 So, required interest earned = (2400 Γ— 10 Γ— 3) Γ· 100 = Rs. 720

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