Simple Interest


Percentages and Its Application III - Concepts
Class - 7th Foundation NTSE Subjects
 
 
Concept Explanation
 

Simple Interest

Rightarrow   that the interest is incurred simply on the principal amount   

OR   

Rightarrow   Simple interest is interest that is calculated each year as a fixed percentage of the original amount of money borrowed or invested . 

Formula:

Rightarrow    small Simple;Interest = frac{P X RX T}{100}    ,

where  P = initial amount , R = rate of interest , T =  time 

OR    

Rightarrow    SI = PIN       

where P = principal or initial amount , I = rate of interest in decimal form , N = time or duration    

Illustration: Mr Bector deposited a sum of Rs 5596 at a simple interest for 5 years at 10% rate of interest. Find Simple interest and the Amount.

Solution :   P = 5596 Rs.

          R = 10 %

          T = 5 Years

     small S.I. = frac{P X R XT}{100}= frac{5596 X 10 X 5}{100}= 2798; Rs

Amount = P + SI = 5596 + 2798 = 8394 Rs

Illustration:  Find the simple interest payable on an investment of $ 20000 at 12% p.a. over a period of 4 years ?

Solution :   here P = 20000 ,  R = 12% which is also 0.12  , N = 4 

now , SI = PIN

      SI =  20000times  0.12 times 4   =  9600 

So the simple interest is $9600 

Sample Questions
(More Questions for each concept available in Login)
Question : 1

In how many years will a sum of money double itself at 4% per annum ?

Right Option : D
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Explanation
Question : 2

For how many years should Rs.1200 be invested at 10% p.a in order to earn the same simple interest as in earned by investing Rs.1800 at 12% p.a for 5 years?

Right Option : A
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Explanation
Question : 3

If certain sum of money was deposited for 5 years at 10% simple interest and amounted to Rs.6000, then the value of amount deposited was _________________

Right Option : A
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Explanation
 
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