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      Question

      Nidhi invested Rs. 2500 at R% S.I. and Rs. 7500 at (R +

      3)% S.I. for 4 years. She paid a total interest of Rs. 4500. Find the rate on Rs. 7500.
      A 20% Correct Answer Incorrect Answer
      B 18% Correct Answer Incorrect Answer
      C 12% Correct Answer Incorrect Answer
      D 32% Correct Answer Incorrect Answer

      Solution

      According to question, 2500 Γ— R/100 Γ— 4 + 7500 Γ— (R + 3)/100 Γ— 4 = 4500 100R + 300R + 300 Γ— 3 = 4500 400R + 900 = 4500 400R = 3600 R = 9% So, R + 3 = 12%

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