Correct Answer: Rs. 4826

Explanation:

We know the formula for calculating

The compound interest  C = P 1 + r 100 n - 1 where P = amount, r = rate of interest, n = time

Here P = 5000, r1 = 10, r2 = 20

Then  $$\begin{gathered} C = 6500 1 + 10 100 2 x 1 + 20 100 2 - 1 \\ = 6500 x 1856 2500 \\ = 65 x 1856 25 \end{gathered}$$

C = Rs. 4826.

Correct Answer: 5%

Explanation:

Let 'R%' be the rate of interest

From the given data,

$$\begin{gathered} 2520 2400 = 1 + R 100 4 1 + R 100 3 \\ ? 1 + R 100 = 63 60 \\ ? R = 5 \end{gathered}$$

 

Hence, the rate of interest R = 5% per annum.

Correct Answer: Rs. 9000

Explanation:

Let Rs. K invested in each scheme

Two years C.I on 20% = 20 + 20 + 20x20/100 = 44%

Two years C.I on 15% = 15 + 15 + 15x15/100 = 32.25%

Now,

(P x 44/100) - (P x 32.25/100) = 528.75

=> 11.75 P = 52875

=> P = Rs. 4500

 

Hence, total invested money = P + P = 4500 + 4500 = Rs. 9000.

Correct Answer: Rs. 441

Explanation:

Given principal amount = Rs. 8000

Time = 3yrs

Rate = 5%

C.I for 3 yrs =  $$\begin{gathered} 8000 x 105 100 x 105 100 x 105 100 - 8000 \\ = Rs . 1261 \end{gathered}$$

 

Now, C.I for 2 yrs =  $$\begin{gathered} 8000 x 105 100 x 105 100 \\ = Rs . 820 \end{gathered}$$

 

Hence, the required difference in C.I is 1261 - 820 = Rs. 441