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    • Question

      Rs. 3,000 becomes Rs. 4,200 in 10 years at simple interest

      of r% p.a. If Rs. 6,000 is invested at 0.5r% p.a. for 6 years, what will be the interest amount?
      A Rs.525 Correct Answer Incorrect Answer
      B Rs.720 Correct Answer Incorrect Answer
      C Rs.650 Correct Answer Incorrect Answer
      D Rs.700 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Interest earned in 10 years = 4200 – 3000 = Rs. 1,200

      Simple interest = Sum invested × rate of interest × time period in years ÷ 100

      So, 1200 = 3000 × r × 10 ÷ 100

      Or, r = 1200 ÷ (10 × 30)

      So, r = 4

      So, new rate of interest = 0.5 × 4 = 2% p.a.

      So, required interest = 6000 × 2 × 6 ÷ 100 = Rs. 720

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