Math Problem Statement

Mr. X deposits ₹2000 at the end of every year for 5 years in his savings account, paying 5% interest compounded annually. He wants to find how much sum of money he will receive at the end of 5th year.

Solution

To solve this problem, we can use the formula for the future value of an ordinary annuity. Since Mr. X is depositing ₹2000 at the end of each year for 5 years at an annual interest rate of 5% compounded annually, the future value can be calculated as follows:

Future Value of an Ordinary Annuity Formula:

FV=P(1+r)n1rFV = P \cdot \frac{(1 + r)^n - 1}{r} Where:

  • FVFV = Future value (amount of money at the end of 5 years)
  • PP = Annual deposit = ₹2000
  • rr = Annual interest rate = 5%=0.055\% = 0.05
  • nn = Number of years = 5

Substituting the values:

FV=2000(1+0.05)510.05FV = 2000 \cdot \frac{(1 + 0.05)^5 - 1}{0.05}

  1. Compute (1+0.05)5(1 + 0.05)^5: (1+0.05)5=1.2762815625(1 + 0.05)^5 = 1.2762815625

  2. Subtract 1: 1.27628156251=0.27628156251.2762815625 - 1 = 0.2762815625

  3. Divide by r=0.05r = 0.05: 0.27628156250.05=5.52563125\frac{0.2762815625}{0.05} = 5.52563125

  4. Multiply by P=2000P = 2000: FV=20005.52563125=11,051.26FV = 2000 \cdot 5.52563125 = 11,051.26

Final Answer:

The amount of money Mr. X will receive at the end of 5 years is ₹11,051.26.


Would you like further clarification or detailed steps for this solution? Let me know!

Here are some related questions for further exploration:

  1. How would the result change if the interest rate were 6% instead of 5%?
  2. What would be the total interest earned over 5 years?
  3. How would the calculation differ if the deposits were made at the beginning of each year?
  4. What is the formula for a single lump-sum deposit compounded over time?
  5. How does compounding frequency (e.g., quarterly vs annually) affect the future value?

Tip: For similar problems, always verify whether deposits are made at the end or beginning of the period, as it changes the formula slightly!

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Math Problem Analysis

Mathematical Concepts

Compound Interest
Future Value of Annuities

Formulas

FV = P * ((1 + r)^n - 1) / r

Theorems

Compound Interest Theorem
Ordinary Annuity Formula

Suitable Grade Level

Grades 10-12