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Summary Grade 11 Financial Mathematics

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Summary of basic Grade 11 Financial Maths . Includes some examples. Interest , Depreciation and nominal/effective rates.

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  • August 24, 2020
  • 9
  • 2020/2021
  • Summary
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monicatakawira
SIMPLE?
Subject: Mathematics. INTEREST CALCULATED ON ORIGINAL
AMOUNT.
COMPOUND?
CALCULATED ON THE AMOUNT WITH
INTEREST. ‘INTEREST ON INTEREST’
Topic: Financial Mathematics.

BASIC CONCEPTS:

1. INTEREST
- COMPOUND INTEREST.
- SIMPLE INTEREST.
2. DEPRECIATION
- LINEAR DEPRECIATION.
- REDUCING BALANCE DEPRECIATION.
3. NOMINAL AND ANNUAL EFFECTIVE RATES.


1. Interest:
Rules to live by:
- Simple interest is for simple people.
- When we are not told which particular interest to use, use COMPOUND interest.




***Note: The formula to find P when given A is as follows:

PA(1i)n


Simple Interest Formula
A= P x i x n
A= final amount
P= principal / initial amount
I= interest rate
- Different compounding periods:
N= Number1. of years invested.
Annually. – once a year. (n and i don’t change)
2. Semi-annually. – every six months. (divide i by 2 and multiply n by 2)
3. Quarterly. – 4 times a year. (divide i by 4 and multiply n by 4)

, 4. Monthly. – every month. (divide i by 12 and multiply n by 12.)

Example:

(on White Board)

2. Depreciation:

? - an item losing value over a period of time.

- Linear depreciation. (SIMPLE)

AP(1i.n)

- Reducing balance depreciation.

AP(1i)n

3. Nominal and Annual Effective Rates.

You need to know the formula off by heart.

Nominal rate ? Does take the compounding period into account and is therefore
more accurate.

Effective rate? Does not take the compounding period into account. (NOT AS
ACCURATE)




Examples:

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