GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Sep 2018, 08:16

# LIVE NOW:

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# During a two-week period, the price of an ounce of silver in

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 49271
During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

10 Jan 2014, 07:09
00:00

Difficulty:

5% (low)

Question Stats:

87% (00:53) correct 13% (01:10) wrong based on 659 sessions

### HideShow timer Statistics

The Official Guide For GMAT® Quantitative Review, 2ND Edition

During a two-week period, the price of an ounce of silver increased by 25 percent by the end of the first week and then decreased by 20 percent of this new price by the end of the second week. If the price of silver was x dollars per ounce at the beginning of the two-week period, what was the price, in dollars per ounce, by the end of the period?

(A) 0.8x
(B) 0.95x
(C) x
(D) 1.05x
(E) 1.25x

Problem Solving
Question: 34
Category: Arithmetic Percents
Page: 66
Difficulty: 600

GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!

_________________
Math Expert
Joined: 02 Sep 2009
Posts: 49271
Re: During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

10 Jan 2014, 07:09
SOLUTION

During a two-week period, the price of an ounce of silver increased by 25 percent by the end of the first week and then decreased by 20 percent of this new price by the end of the second week. If the price of silver was x dollars per ounce at the beginning of the two-week period, what was the price, in dollars per ounce, by the end of the period?

(A) 0.8x
(B) 0.95x
(C) x
(D) 1.05x
(E) 1.25x

The price by the end of the period = (x*1.25)*0.8 = x.

_________________
Director
Joined: 03 Feb 2013
Posts: 892
Location: India
Concentration: Operations, Strategy
GMAT 1: 760 Q49 V44
GPA: 3.88
WE: Engineering (Computer Software)
Re: During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

10 Jan 2014, 11:07
1
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

During a two-week period, the price of an ounce of silver increased by 25 percent by the end of the first week and then decreased by 20 percent of this new price by the end of the second week. If the price of silver was x dollars per ounce at the beginning of the two-week period, what was the price, in dollars per ounce, by the end of the period?

(A) 0.8x
(B) 0.95x
(C) x
(D) 1.05x
(E) 1.25x

After 25% increase , the value is 1.25 x
after 20% decrease, the value is 1.25 * 0.8 * x = x - option C)
_________________

Thanks,
Kinjal

My Application Experience : http://gmatclub.com/forum/hardwork-never-gets-unrewarded-for-ever-189267-40.html#p1516961

Math Expert
Joined: 02 Sep 2009
Posts: 49271
Re: During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

11 Jan 2014, 06:58
SOLUTION

During a two-week period, the price of an ounce of silver increased by 25 percent by the end of the first week and then decreased by 20 percent of this new price by the end of the second week. If the price of silver was x dollars per ounce at the beginning of the two-week period, what was the price, in dollars per ounce, by the end of the period?

(A) 0.8x
(B) 0.95x
(C) x
(D) 1.05x
(E) 1.25x

The price by the end of the period = (x*1.25)*0.8 = x.

_________________
SVP
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1834
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)
Re: During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

07 Aug 2014, 02:47
2
Initial Price = x

25% increase$$= \frac{125x}{100}$$

20% decrease$$= \frac{125x}{100} * \frac{80}{100} = x$$

_________________

Kindly press "+1 Kudos" to appreciate

Senior Manager
Joined: 25 Mar 2013
Posts: 256
Location: United States
Concentration: Entrepreneurship, Marketing
GPA: 3.5
Re: During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

22 Dec 2016, 20:10
1 Week : (1.25)x
2nd Week : (0.80)(1.25)x
x
C
_________________

I welcome analysis on my posts and kudo +1 if helpful. It helps me to improve my craft.Thank you

Intern
Joined: 13 Dec 2016
Posts: 43
Re: During a two-week period, the price of an ounce of silver in  [#permalink]

### Show Tags

22 Feb 2017, 03:55
Alternate approach when two successive rate changes are given:
final change is =25+(-20)+ (25)(-20)/100 =0

Hence, no change in price after two week.
Re: During a two-week period, the price of an ounce of silver in &nbs [#permalink] 22 Feb 2017, 03:55
Display posts from previous: Sort by

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.