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(b) Let the percentage of the amount of money spent be y.

Amount of money spent y
=
Total amount of money 100
÷ 3

15 = y
300 100

÷ 3
y = 5
CHAPTER
4 Puan Jorana spends 5% of the total amount of money.

19

At a sale carnival, Encik Rosli chooses a shirt from a rack which displays ‘45% price
reduction’. The original price of the shirt is RM85. 00. When Encik Rosli scans the price
tag of the shirt, the scanner shows that the price is RM57. 80. By applying the concept
of proportions, determine whether this percentage discount corresponds to the percentage
reduction displayed. Give a reason for your answer.

Let p be the percentage discount of the original price.

p Selling price
Thus, =
100 Original price

p 57.80
=
100 85.00
85p = 5 780
5 780
p =
85
= 68

The selling price is 68% of the original price.

Percentage discount obtained = 100% – 68%
= 32%

The percentage discount obtained by Encik Rosli is less than the percentage reduction
displayed.

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Chapter 4

04 TB Math F1.indd 96 11/10/16 12:12 PM