On what sum of money will the simple interest and compound interest for 2 years at 5% per annum be equal to 25?

On what sum of money will the difference between simple interest and compound interest for 2 years at 5% per annum be equal to Rs. 63 ?

A. Rs. 24600

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B. Rs. 24800

C. Rs. 25200

D. Rs. 25500

Answer: Option C

Solution(By Examveda Team)

$$\eqalign{ & {\text{Rate of interest = 5}}\% {\text{ per annum}} \cr & {\text{Time = 2 year}} \cr & {\text{Accroding to question,}} \cr & \Rightarrow P\left[ {{{\left( {1 + \frac{r}{{100}}} \right)}^n} - 1} \right] - \frac{{P \times r \times t}}{{100}}{\text{ = 63}} \cr & \Rightarrow P\left[ {{{\left( {1 + \frac{5}{{100}}} \right)}^2} - 1} \right] - \frac{{P \times 5 \times 2}}{{100}}{\text{ = 63}} \cr & \Rightarrow P\left[ {{{\left( {1 + \frac{5}{{100}}} \right)}^2} - 1} \right] - \frac{{10P}}{{100}}{\text{ = 63}} \cr & \Rightarrow P\left[ {{{\left( {\frac{{105}}{{100}}} \right)}^2} - 1} \right] - \frac{{10P}}{{100}}{\text{ = 63}} \cr & \Rightarrow P\left( {\frac{{11025 - 10000}}{{10000}}} \right) - \frac{{10P}}{{100}} = 63 \cr & \Rightarrow \frac{{1025P}}{{10000}} - \frac{{10P}}{{100}} = 63 \cr & \Rightarrow \frac{{1025P - 1000P}}{{10000}} = 63 \cr & \Rightarrow 25P = Rs.630000 \cr & \Rightarrow P = \frac{{630000}}{{25}} \cr & \Rightarrow P = Rs. 25200 \cr & {\text{Hence}},\,{\text{sum Rs}}{\text{. 25200}} \cr} $$


Question

On what sum of money will the difference between the compound interest and simple interest for 2years be equal to Rs 25 if the rate of interest charged for both is 5% p.a. 

Hint:

Use the formula of compound interest and simple interest to get the principal amount.

The correct answer is: Rs 10000


    Complete step by step solution:Let the principal amount = PIt is given that the rate of interest R = 5% and number of years T = 2 years.So, compound interest for 2 years = Simple  interest for 2 years = It is given that compound interest - simple interest = 25 RupeesThat is,  Rupees.Hence the principal amount = Rs 10000

    On what sum of money will the difference between simple interest and compound interest for 2 years at 5% per annum be equal to Rs. 63/-

    1. Rs. 24600/-
    2. Rs. 24800/-
    3. Rs. 25200/-
    4. Rs. 25500/-

    Answer (Detailed Solution Below)

    Option 3 : Rs. 25200/-

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    Given: 

    Time is 2 years

    Rate is 5% per annum

    The difference between simple interest and compound interest is Rs. 63.

    Concept: 

    S.I = (P × R × T)/100

    C.I = P[(1 + r/100)n - 1]

    Here, n is the number of terms in the year

    Calculation: 

    Let sum be Rs. P 

    Now, 

    The simple interest for 2 years at 5% per annum is

    (P × 5 × 2)/100

    ⇒ P/10 

    Now, 

    The compound interest for 2 years at 5% per annum is

    P[(1 + 5/100)2 - 1]

    ⇒ P[(21/20)2 - 1]

    ⇒ P[(441/400) - 1]

    ⇒ 41P/400 

    So, 

    The difference between Compound interest and simple interest is 

    ⇒ 41p/400 - P/10 = 63

    ⇒ 41P - 40P = 63 × 400

    ⇒ P = Rs. 25200 

    ∴ The required sum of money is Rs. 25200.

    On what sum of money will the simple interest and compound interest for 2 years at 5% per annum be equal to 25?
    Shortcut Trick

    The difference between compound interest and simple interest for 2 years is 

    ⇒ P(r/100)2

    According to question 

    ⇒ P(5/100)2 = 63

    ⇒ P × 1/400 = 63

    ⇒ P = 63 × 400 

    ⇒ P = 25200 

    ∴ The required sum of money is Rs. 25200

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