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Simple interest




Interest – An amount charged for the use of money

Principal – The amount of money borrowed

Term – The length of the transaction period; it starts on the origin date and ends on the maturity date

Maturity value – the amount of money received at the end of the term; the sum of the principal and the interest earned




Simple interest – A type of interest wherein only the original principal earns interest for the duration of the term


Formula for simple interest  


Interest = Principal × Rate  ×  Time




Example 1


Find the interest earned after 3 years if  ₹ 12,000 is deposited in a savings account which earns 5% simple interest.

Solution :


I = 12000x .05x 3

I = 1800


Example 2

If you invested ₹ 200.00 in an account that paid simple interest of 4%, find the maturity value after 1.5 — years.


S = Principal + Interest

S= P+I

S = P + PRT

S = 200 + 200x.04x1.5

S=200+ 12

S = ₹ 212




  1.  When invested at an annual interest rate of 6% an account earned 180.00 of simple interest in one year. How much money was originally invested in the account ?

  2. A savings account is set up so that the simple interest on the investment is moved into a separate account at the end Of each year. If an Investment of 7,000 accumulate 910 Of interest in the account after 2 years, what was the annual simple interest rate on the saving account ?

  3. Mr. Anand invested an amount of ₹ 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?

  4.  Asmita took a loan of ₹ 1200 with simple interest for as many years as the rate of interest. If she paid ₹  432 as interest at the end of the loan period, what was the rate of interest?

  5. There was simple interest of ₹  4016.25 on a principal amount at the rate of 9%p.a. in 5 years. Find the principal amount