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

At a certain rate of simple interest, a certain sum doubles itself in 10 years. It will triple itself in ________________

Right Option : C
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Explanation
Question : 2

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

Right Option : D
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Question : 3

Rajan borrowed Rs.50000 from Rakesh at Simple Interest. After 3 years, Rakesh got Rs.3000 more than what he had given to Rajan. What was the rate of interest per annum?

Right Option : A
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Explanation
 
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