Monday, 24 March 2014

Simple Interest Formula

S.I=[( P X N X R )/ 100 )].
Here,
P = Principle.
R = Rate per annum.
N= Number of years.

simple interest formula and problems
simple interest formula and problems

How to Calculate Simple Interest


What is Interest?
When borrowed a quantity of money from other for the personal or commercial purpose we pay some additional money to him after a certain period of time is called Interest. So we can also call this Interest as<b> Simple Interest. This type of problem is given in Quantitative Aptitude which is a very essential paper in banking exam.
What is Principle?
The money borrowed for a certain time period called<b> Principle or Sum.
What is Amount?
Addition of Simple Interest and Principle is called the amount.
Amount = Principle + Interest.

Simple Interest Formula & Problems 1

A sum of money at simple interest amounts to Rs. 815 in 3 years and to Rs. 854 in 4 years. The sum is:

S.I. for 1 year = Rs. (854 - 815) = Rs. 39.
S.I. for 3 years = Rs.(39 x 3) = Rs. 117.
Principal = Rs. (815 - 117) = Rs. 698.
           

Simple Interest Formula & Problems 2


Mr. Thomas invested an amount of Rs. 13,900 divided in two different schemes A and B at the simple interest rate of 14% p.a. and 11% p.a. respectively. If the total amount of simple interest earned in 2 years be Rs. 3508, what was the amount invested in Scheme B?

Let the sum invested in Scheme A be Rs. x and that in Scheme B be Rs. (13900 - x).
(Xx14x2/100)+[(13900-x)x11x2/100]=3508
=>28x - 22x = 350800 - (13900 x 22)
=>6x = 45000
x = 7500.
So, sum invested in Scheme B = Rs. (13900 - 7500) = Rs. 6400.

Simple Interest Formula & Problems 3


A sum fetched a total simple interest of Rs. 4016.25 at the rate of 9 p.c.p.a. in 5 years. What is the sum?
Principal              
= Rs. [(100 x 4016.25)/(9x5)]                       
= Rs. (401625/45)            
= Rs. 8925.

Simple Interest Formula & Problems 4


How much time will it take for an amount of Rs. 450 to yield Rs. 81 as interest at 4.5% per annum of simple interest?

Time = [(100 x 81)/(450x4.5)]      = 4 years.

Simple Interest Formula & Problems 5


 A sum of money gets doubled at 12% per annum. Then find the time?
solution:
 time= 100(n-1)/R
      =100(2-1)/12
      =100/12
      = 25/3 years

Simple Interest Formula & Problems 6


 A person borrows  x $ say $ 5000 for t years say 2 years at r1% say 4% per annum on simple interest. He uses his smartness and lends it to another person at bigger rate r2 % say 6.25% per annum for the same time. then his total gain in this transaction will be

={PT(r2-r1)}/100
= {5000*2(6.25-4)}/100
= 100*2.25
=  $ 225

Simple Interest Formula & Problems 7


The rate of interest on a sum of money is 4% per annum for the first 2 years, 6% per annum for the next 4 years and 8% per annum for the period beyond 6 years. If the simple interest accrued by the sum for the total period of 9 years is Rs 1120. What is the sum?

Ans= 2000

We suggest you to read Aptitude questions about Pipes and Cisterns

Simple Interest Formula & Problems 8


Two equal amount of money was deposited in two banks, each at 15% per annum, 3.5 years and 5 years respectively. If the difference between the interests is Rs 144, each sum is:

Ans= 640

Simple Interest Formula & Problems 9


If Rs. 64 Amount to Rs. 83.20 in 2 years, what will Rs. 86 amount to in 4 years at the same rate percent per annum?

Ans = 51.60

Simple Interest Formula & Problems 10


If Rs. 750 amounts to Rs. 1000 in 5 years, What will it become in 10 years at S.I?

Ans = 1250

Simple Interest Formula & Problems 11


How long will it take for a sum of money to grow from Rs.1250 to Rs.10,000, if it is invested at 12.5% pa simple interest?

Ans = 56

Comments (9)

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thank u 4 posting keep it up

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henrymarker · 417 weeks ago

Thank you for sharing this information
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henrysmith · 416 weeks ago

looking good article thanks for posting this
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Simple Interest is a topic which seems quite easy on paper but we aspirants know how tricky this stuff can truly get when mixed with exam pressure. Great content as always!

There are much more quantitative aptitude content out there which help in cracking any exam on given day.
thanks for sharing this helpful article
So interesting! Thanks
Hey thank you for explaining so well this formula. I really enjoy the way which is so simple and easy. Students can also learn from it by having trust.
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best ideas · 344 weeks ago

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good writing. verty interesting consultant

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