Question

please give me answer​

Answer 1

Rate of interest is 15% per annum.

Step-by-step explanation:

We are given that a sum of Rs 20,000 is invested in the compound interest scheme for 2 years and the amount obtained after 2 years is Rs 26,450.

Let P = Principal sum of money

     R = Rate of interest

     T = Time period

     A = Amount of money

As we know that the formula for calculating amount in case of compound interest is given by;

                  $\text{Amount}=\text{Principal} \times (1+\text{Rate of interest})^{\text{Time}}$

                                               Or

                             $A=P\times (1+R)^{T}$

Now, in the question we are provided with P = Rs 20,000 , A = Rs 26,450 and Time period, T = 2 years.

So, putting values in above equation we get;

                        $26450=20000 \times (1+R)^{2}$

                        $(1+R)^{2} = \frac{26450}{20000}$

                         $(1+R)^{2} = 1.3225$

Taking square root on both sides, we get;

                        (1 + R) =  $\sqrt{1.3225}$

                        (1 + R) =  1.15

                          R = 1.15 - 1 = 0.15 or 15%

Therefore, rate of interest is 15% per annum.

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Answer 2

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