### Chap 10 Percentages: Which is a Better Deal? (III)

Mr Yeo wanted to buy a portable hard-drive, Iomega Prestige (1TB) to store the multimedia productions by the students.

While he was surfing the Internet to look for a good deal, Mr Yeo chanced upon the eBrochure of the PC Show 2011 in June.

He exclaimed, "Oops! I missed a good deal!".

Next, Mr Yeo went to the Challenger Computer Store, site and found the same product but offering at a lower price!

(1) Mr Yeo is not a member of the Challenger Store. Find the percentage he saved, compared to another friend who bought the same device at the PC Show.

(2) If Mr Yeo decides become a member (at the point of payment) to enjoy the member's price. Find the percentage he saved, compared to buying at the PC Show.

1. (1)\$129-\$109 =\$20
20/129 x 100 = 15.5% (3SF)

(2)\$129-\$85=\$44
44/129 x 100 =34.1% (3SF)

From: Nina and Ruoyu

2. (1) 120-109=20
\$(20/129) * 100% = 15.5% (3sf)
He saved 15.5% (3 sf) compared to his friend

(2) 129-85=44
\$(44/129) * 100% = 34.1% (3sf)
He saved 34.1% (3 sf) compared to buying at the PC show

3. From: Jiajun and Wei Siew
1) 129-109
20/109 x 100=18.3%(3 SF)
He saved 18.3%

2) 129-85=44
44/109 x 100= 40.4%(3 SF)
He saved 40.4%

4. All the groups have submitted:
1. Jiajun and Wei Siew
3. Nina and Ruoyu

5. (a) To answer to the first question, we would find the difference = \$129 - \$109
i.e. PC Show Price minus Non-member's price
Difference = \$20
In this case, we use the PC Show Price as the original price (that Mr Yeo saved from)
Hence, percentage saved = \$20/\$129 X 100%
= 15.5% (3SF)

(b) Difference = \$129 - \$85
= \$44
Percentage saved (if Mr Yeo is a member)
= \$44/\$129 X 100%
= 34.1% (3SF)