PERCENTAGE PERCENTAGE PROBLEMSPROBLEMS

DEVELOPED BY:DEVELOPED BY:NORASIAH BINTI HAJI MOHAMMEDNORASIAH BINTI HAJI MOHAMMED

(03B3803)(03B3803)

SIMPLE PERCENTAGE SIMPLE PERCENTAGE PROBLEMPROBLEM

There are There are two (2) strategiestwo (2) strategies to tackle to tackle a percentage problem as in the a percentage problem as in the example below:example below:Example 1:Example 1:

A school library has a collection of A school library has a collection of 400 books of which 80 are new. Find 400 books of which 80 are new. Find the percentage of new books?the percentage of new books?

SIMPLE PERCENTAGE PROBLEMSIMPLE PERCENTAGE PROBLEM

The The first strategyfirst strategy is to is to find the % of unit find the % of unit quantity of a given quantity and multiply quantity of a given quantity and multiply the result with the required %.the result with the required %.

400 books = 100%400 books = 100% 1 book = 1 book = 100100% %

400400 Therefore,Therefore, 80 books = 80 X 80 books = 80 X 100100% = % = 20%20%

400400

SIMPLE PERCENTAGE PROBLEMSIMPLE PERCENTAGE PROBLEM

• The The second strategysecond strategy is to is to find the find the % of certain amount that could % of certain amount that could lead to the finding of % of the lead to the finding of % of the required amount.required amount.

• 400 books = 100%400 books = 100%• 40 books = 10%40 books = 10% Therefore,Therefore,• 80 books = 80 books = 20%20%

SIMPLE PERCENTAGE PROBLEMSIMPLE PERCENTAGE PROBLEM

Example 2:Example 2:

Syukri scored 88% of the total marks in his Syukri scored 88% of the total marks in his final examination. If the total marks were final examination. If the total marks were 800 marks, how many marks did he score?800 marks, how many marks did he score?

Strategy 1:Strategy 1:

100 % = 800 marks100 % = 800 marks

1 % = 800 / 100 = 8 marks1 % = 800 / 100 = 8 marks

Therefore, 88 % = 88 x 8 = Therefore, 88 % = 88 x 8 = 704704 marksmarks

Strategy 2: Strategy 2: Find the amount of certain % Find the amount of certain % that could lead to the finding of amount of that could lead to the finding of amount of the required %.the required %.

100% = 800 marks100% = 800 marks 1% = 8 marks1% = 8 marks 80 % = 640 marks80 % = 640 marks Therefore,Therefore, 88 % = 80% + 8%88 % = 80% + 8% = 640 marks + (8X8)marks= 640 marks + (8X8)marks = 640 marks + 64 marks = 640 marks + 64 marks = = 704 marks704 marks

THE ENDTHE END