Correct Answer: Rs. 1400

Explanation:

We know thatThe Difference between Compound Interest and Simple Interest for n years at R rate of interest is given by  C . I n - S . I n = P R 100 n

Here n = 2 years, R = 20%, C.I - S.I = 56

$$\begin{gathered} 56 = P 20 100 2 \\ = > P = 56 x 5 2 \\ = > P = 56 x 25 \\ = > P = Rs . 1400 \end{gathered}$$

Correct Answer: Rs. 6540

Correct Answer: 11

Explanation:

Interest earned in scheme M =   

P 1 + 20 100 2 - 1 = 11 P 25

Interest earned in scheme N =  

P x k x 2 100 = P k 50

 

Now, from the given data,

 

11 P 25 = 2 x P k 50

k = 11

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: 2648

Explanation:

8000 × 33.1% = 2648

Correct Answer: Rs. 2.04

Explanation:

Compound Interest for 1 ¹?₂ years when interest is compounded yearly = Rs.(5304 - 5000)

Amount after 1¹?₂ years when interest is compounded half-yearly 


Compound Interest for 1 ¹?₂ years when interest is compounded half-yearly = Rs.(5306.04 - 5000)

Difference in the compound interests = (5306.04 - 5000) - (5304 - 5000)= 5306.04 - 5304 = Rs. 2.04

Correct Answer: 5%

Explanation:

Given compound interest for 3 years = Rs. 1513.2

 

and simple interest for 5 years = Rs. 2400

 

Now, we know that  C.I =  P 1 + R 100 n - 1

 

=> 1513.2 =  P 1 + R 100 3 - 1 ...........(A)

 

And S.I = PTR/100

 

=> 2400 = P5R/100 ..................(B)

 

By solving (A) & (B), we get

 

R = 5%.

Correct Answer: 6

Explanation:

Let us assume Amount be 100 Rs and we calculate in CI

 First year 60% of 100 = 60 amount (100+60) is 160

 Second year 60% of 160 = 96 amount (160+96) is 256

 Third year 60% of 256 =153.6 amount (256+153.6) is 409.6

 Here the Amount of 100 Rs is quadrapled in 3 years.

 One year contains 2 half years

 Three year has 6 half years.

 Therefore,  It takes 6 half years.