--BASIC MATHEMATICS--PERCENTAGE

PREPARED BY—RBT BOYZZ

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percentage

Percentage of a quantity

Percentage of increase

and decrease

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Perform computations and solve problems

To determine the percentage of a quantitya) Convert the percentage into a fraction with 100 as the

denominatorb) Multiply the fraction by the quantity

Example: find 20% of 150

= 20 x 150 100 = 30

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Finding a number given the percentage

To find a number given percentage a) Divide the given value by the percentage givenb) Multiply by 100

Number = given value x 100 given percentage

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example

Find the value of m if 15% of m is 90

Solution: 15 = 90 100 m m = 90 x 100 15 = 600

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Finding the percentage of increase or decrease

A change in a value can be shown as an increase or decrease from the original value

Percentage increase = increase in value x 100% original valuePercentage decrease = decrease in value x 100% original value

Decrease in value = original value – new value

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exampleLast year, the bus fare for alice was RM48 per month.This year the new bus fare is RM52 per month.find the percentage increase of bus fare.

Solution: Increase in value = 52 – 48 = 4Percentage increase = 4 x 100 48 = 8.33%

There is 8.33% increase in the bus fare.

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Profit and lossa) Profit is the money realized when an item is sold above

the costb) Loss is the money lost when an item is sold below the

cost

Profit = selling prices – cost prices

% profit = profit x 100% cost price

Loss = cost price – selling prices

% loss = loss x 100% cost price

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discounta) Discount is reduction on the original selling price of an

itemb) Percentage discount is the percentage taken off the price

Discount = original selling prices – new selling prices

% discount = discount x 100% original selling prices

Discount = % discount x original prices

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Simple interesta) Simple interest is the amount paid by bank to the

depositor on the principal alone for a stated period of time

b) Interest rate is the percentage of interest given on principal for a period time

Simple interest = interest rate x principal x time

Interest rate = simple interest x 100% principal x time

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Dividend and commissiona) Dividend is the part of profit that is given by a company

to its shareholdersb) Commission is the amount of money earned for selling

goods or servicesc) The rate of commission is the percentage earned by the

seller of the total amount of goods or services sold

Commission = rate of commission x total sales

Rate of commission = commission x 100% total sales

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THANK YOU………..SELAMAT HARI RAYA

MAAF ZAHIR DAN BATIN