Simple Interest and Compound Interest Difference

I need money. I don't have enough to meet my requirement. Then what should I Do? 

Well I have 3 wonderful options. 

1. Robing a Bank : It needs Courage, Effort, Planning and Hard-work. Well I am sure that I don't have any of these. 
2. To kidnap you and ask your dad for money : Ummmm, not a good idea!!! Nexxxxxxxt
3. To borrow the money from my friend. Sounds good, isn't it? 
• But Nobody gonna give me money if Isay that I'm not going to return it to him. So, I should promise him that I will return the amount within a specif amount of time (not really :P). And in-order to TEMPT him, I also will promise him that I will return his money with some ADDITIONAL money. This additional money is called INTEREST. 
• There are TWO types of Interests are there

• Simple Interest : The amount charged by the lender for giving you his money for a specific amount of time. 
• Compound Interest : Here also same. But here the lender calculates the Interest on Interest if the given time exceeds (dont worry if you are unable to understand what I am saying. We shall discuss about this in our next post. Now concentrate on Simple Interest)

When money is borrowed at Simple Interest, the interest charged is same irrespective of the period involved.  

       I mean, if Simple Interest for One year is Rs 1000/-, then for 2 Years with teh same rate percent, it will be 2X1000 = 2000/-

So, for 8 years it will be 8 X1000 = 8000.

So, if the Simple Interest (or SI in shorter form) on a certain sum is Rs 600 in 3 yrs, then the SI on that sum for one year will be 600/3 = 200

Now have a look at some formulas :

SI = (P*T*R)/100

   Where 

• SI=Simple Interest    
• P= Principle (the actual money borrowed)  
• T=Time  in Years  
• R=Rate of % per annum (The percentage of the Principle, we should pay as the Interest)

So, Obviously

• P = (100I) /TR
• T = (100I) /PR
• R = (100I) / PT

Now, how much money we should pay to the Lender?

Its the total of the money we have taken from him and the money we should pay in the name of Interest.

So, Amount A = P+I       The actual amount (Principle) + Interest

Now lets see some Examples

•   Click HERE for Practise Problems on Simple Interest
• Check Detailed Explanation of Compound Interest here