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Web Development : Starting from Concept, HTML, CSS, Web Site Develpment to Website Launching.

Written by: Sanjay Srivastava

B.Tech (Honours);IIT Kharagpur

PMP ; PMI USA

Class - VIII - Maths:- INDEX

1. Squares & Square Roots2. Cubes & Cube Roots

3. Exponents & Radicals

4. Profit Loss & Discount

5. Compound Interest

6. Algebraic Identities

7. Polynomials

8. Linear Equations

9. Parallel Lines

10. Types of Quadrilaterals

11. Construction of Quadrilaterals

12. Circles

13. Areas

14. Surface Areas

15. Volumes

16. Statistics

Class - VIII - Maths
## What is Compound Interest Formula (Page 2/3)

(Contiued from page 1 )

__Important Tips__
(1) Be careful to read during the exam regarding the formula of simple interest or compound interest.

(2) If the interest rate is doubled / tripled, then the simple interest rate will get doubled / tripled. In case of compound interest the increase will be more than the increase of rate of interest

Question - Type 2 - What is the loss in interest if Rs 20000 deposited for 3 years at interest rate of 10% per annum and simple interest is calculated in place of compound interest.

Answer - 2-__ Simple Interest__ = 20000 * 3 * 10 /100

20000 * .3 =__Rs 6000__

__Compound Interest __ = 20000 *((1+10/100)^3-1)

= 20000 * ((1.1)^3-1)) = 20000 (.331) =__Rs 6620__

Therefore loss = C.I. - S.I.

= 6620 - 6000 = Rs 620

Question - Type 3 - If the interest rate in the previous questions is doubled. Will interest will be doubled in both the cases i.e. simple and compound interest.

Answer - 3- YES & NO - In case of simple interest the interest amount will be doubled. But in the case of compound interest, it will be more than double. (refer next question on next page.)

(Cont..... to page 3 )

© funandhobby.com (* What is Compound Interest Formula*)

(2) If the interest rate is doubled / tripled, then the simple interest rate will get doubled / tripled. In case of compound interest the increase will be more than the increase of rate of interest

Question - Type 2 - What is the loss in interest if Rs 20000 deposited for 3 years at interest rate of 10% per annum and simple interest is calculated in place of compound interest.

Answer - 2-

20000 * .3 =

= 20000 * ((1.1)^3-1)) = 20000 (.331) =

Therefore loss = C.I. - S.I.

= 6620 - 6000 = Rs 620

Question - Type 3 - If the interest rate in the previous questions is doubled. Will interest will be doubled in both the cases i.e. simple and compound interest.

Answer - 3- YES & NO - In case of simple interest the interest amount will be doubled. But in the case of compound interest, it will be more than double. (refer next question on next page.)

(Cont..... to page 3 )

© funandhobby.com (