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Placement Preparation
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**Quantitative Aptitude**Offline Downloads:
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SIMPLE INTERST CONCEPT
Definition of the term Interest: Interest is actually one of the most fundamental
business terms, and without it, the financial trading of the world would come to
standstill. Interest is defined as the “time value of money”.
What exactly does this mean?
Well, look at this way: with time, the value of money changes. Suppose you have Rs. 100
in the year 2000. Would it still be Rs. 100 or would the amount have grown? If you had
deposited the money in a saving bank account, say with an annual rate of interest 4%,
that money would have definitely grown by now. Can you calculate the amount you
would have with you in 2013? Well, in case you can’t right now, go through these
concept notes and you would know the answer.
The concept of simple and compound interest is especially applicable to the world of
banking and economics. Whenever we borrow a certain sum of money (known as the
principal), we pay back the original amount accompanied with a certain amount of
interest on that amount. In a way, those are the charges of borrowing that sum of
money. Simple interest is one method of determining the amount due at the end of loan
duration. Another method of interest application is compound interest, but we study
about it in next article.
Simple Interest Tooltip1: The Definitions
Principal (P): The original sum of money loaned/deposited. Also known as capital.
Interest (I): The amount of money that you pay to borrow money or the amount of
money that you earn on a deposit.
Time (T): The duration for which the money is borrowed/deposited.
Rate of Interest (R): The percent of interest that you pay for money borrowed, or
earn for money deposited
Simple Interest Tooltip 2: The Formula
Where:
P: Principal (original amount)
R: Rate of Interest (in %)
T: Time period (yearly, half-yearly etc.)
Amount Due at the end of the time period, A = P (original amount) + SI

If you have a close look, Simple Interest is nothing else but an application of the
concept of percentages.
Simple Interest Tooltip 3: Basic Problems to explain the concept
Basic Problem 1: What is the SI on Rs. 7500/- at the rate of 12% per annum for 8
years?
Using the Basic Formula:
Simple Interest (SI) = (P x R x T)/100
P – Principal amount, T- Number of years, R – Rate of Interest
Given P = 7500, T = 8 Years, R = 12%
Simple Interest (S.I.) = (7500X12X8)/100
Simple Interest (S.I.) = 7200
Basic Problem 2: A man borrowed Rs 15000/- at the rate of 24% SI and to clear the
debt after 6years, much he has to return:
Using the Basic Formula:
Simple Interest (SI) = (P x R x T)/100
P – Principal amount, T- Number of years, R – Rate of Interest
Given P = 15000, T = 6 Years, R = 24%
Simple Interest (S.I.) = (15000X24X6)/100= Rs 21600
Therefore, total interest = 21600
Total repayment = S.I + Principal amount = 21600 + 15000 = Rs 36600
Basic Problem 3: A man borrowed Rs.12000 at the rate of 10% SI, and lent the same
sum toanother person at the rate of 15% what will be the gain after 5 years?
Using the Basic Formula:
Simple Interest (S.I.) = (P x R x T)/100
P – Principal amount, T- Number of years, R – Rate of Interest
The man borrowed at 10% and he lent the same sum to another person at 15%
Therefore, his gain is actually equal to the different in the interest rate (per year)
= 15 – 10 =5% for 1 year
Thus, to calculate his gain, we use this difference as the rate of interest.
Given T = 5 years and P = Rs. 12000
Amount Gained = (12000x5x5)/100 = Rs 3000
Therefore, his gain = Rs 3000/Tips, Tricks & Results for Simple Interest-1
The purpose of this article is to provide you with some useful tips and
tricks that you can use for Simple Interest questions. Various applications
and formulas based on this concept are explained here.

Simple Interest Tips, Tricks, and Results: Tooltip 1
Example : The interest on a sum of money is 1/16 of the principal, and the number of
years is equal to the rate of interest. What is the rate percent?

Example: The rate of interest for 3 years is 4%, 5years is 6%,1 years is 5%. If a man gets
interest of Rs. 4700 for 9 years, calculate the principal amount?

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