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      Question

      If Rs. 12,500 is invested at simple interest for 2.5

      years and the total amount becomes Rs. 15,625, what is the rate of interest per annum?
      A 25 Correct Answer Incorrect Answer
      B 15 Correct Answer Incorrect Answer
      C 10 Correct Answer Incorrect Answer
      D 21 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Interest earned = 15,625 - 12,500 = Rs. 3,125

      Simple interest = (Principal Γ— Rate Γ— Time) Γ· 100

      So, 3,125 = (12,500 Γ— r Γ— 2.5) Γ· 100

      Or, 3,125 = 312.5 Γ— r

      Or, r = 3,125 Γ· 312.5 = 10

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