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Question

If the difference between the compound interest and the simple interest on a certain sum of money at 8 % p.a. for 2 years is ₹240, then the sum of money is:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
₹37,500

The question asks for the sum of money (Principal, P) given the difference between compound interest (CI) and simple interest (SI) for 2 years at a specific rate.

Calculating the Principal Sum

We are given:

  • Rate of Interest (R) = 8% per annum
  • Time Period (T) = 2 years
  • Difference between CI and SI = ₹240

For a time period of 2 years, the difference between compound interest and simple interest is given by the formula:

Difference = $P \times \left( \frac{R}{100} \right)^2$

Where P is the Principal sum.

Step-by-Step Solution

  1. Substitute the given values into the formula:

    $240 = P \times \left( \frac{8}{100} \right)^2$

  2. Simplify the term in the parenthesis:

    $\frac{8}{100} = \frac{2}{25}$

    $240 = P \times \left( \frac{2}{25} \right)^2$

  3. Calculate the square:

    $240 = P \times \frac{4}{625}$

  4. Rearrange the equation to solve for P:

    $P = 240 \times \frac{625}{4}$

  5. Perform the final calculation:

    $P = 60 \times 625$

    $P = 37,500$

Therefore, the sum of money is ₹37,500.

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Similar Questions

  1. If the interest earned during the $2^{\text{nd}}$ year on a certain sum is ₹6,258, and the rate of interest is 20% per annum compounded annually, then the sum is:
  2. The difference between compound interest and simple interest, at the same rate, on an amount of ₹15,000 for 2 years is ₹24. What is the rate of interest per annum?
  3. There is 60% increase in an amount in 6 years at simple interest. What will be the compound interest of ₹10,000 after 3 years at the same rate?
  4. Simple interest on a sum of money, at $5\%$ per annum for 2 years, is ₹50. The compound interest on the same sum for the same period at the same interest rate is:
  5. Find the interest (in ₹) on ₹8,000 at 10% per annum compounded half yearly for $1\frac{1}{2}$ years.

  6. The difference between the compound interest and the simple interest accrued, at the same rate of interest, on an amount of ₹16,000 in 2 years was ₹1,000. What was the rate of interest percent per annum?
  7. Find the compound interest on ₹1,200 at 12% p.a. for 6 months compounded quarterly.
  8. A sum of money was lent on compound interest. It became ₹500 at the end of the first year and ₹550 at the end of second year. Find the rate of compound interest per annum.
  9. A deposited ₹8,000 in a bank at 8% per annum simple interest. B deposited ₹6,000 at 10% compound interest per annum. After 3 years the difference between their interest will be:
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Important Questions from Simple and Compound Intrest

  1. The difference between the simple interest and the compound interest, compounded annually, on a certain sum of money for 2 years at 16% per annum is ₹797. Find the sum (rounded off to the nearest integer).
  2. The difference between the compound interest, compounded annually and the simple interest if ₹17,700 is deposited at 4% rate of interest per annum for 2 years is:
  3. The difference between the simple interest and the compound interest, compounded annually, on a certain sum of money for 2 years at 10% per annum is $₹407$. Find the sum [rounded off to the nearest integer].
  4. The difference between the simple interest and the compound interest, compounded annually, on a certain sum of money for 2 years at 17% per annum is ₹967. Find the sum [rounded off to the nearest integer].

  5. When the difference between compound interest, compounded annually, and simple interest for three years is ₹217 at 10% interest per annum, the principal is ₹______.
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