Last visit was: 17 Jul 2024, 13:21 It is currently 17 Jul 2024, 13:21
Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
SORT BY:
Date
avatar
Intern
Intern
Joined: 05 Jul 2012
Posts: 10
Own Kudos [?]: 77 [22]
Given Kudos: 7
Send PM
Most Helpful Reply
Math Expert
Joined: 02 Sep 2009
Posts: 94383
Own Kudos [?]: 641753 [5]
Given Kudos: 85693
Send PM
General Discussion
User avatar
Director
Director
Joined: 02 Sep 2012
Status:Far, far away!
Posts: 856
Own Kudos [?]: 4916 [2]
Given Kudos: 219
Location: Italy
Concentration: Finance, Entrepreneurship
GPA: 3.8
Send PM
avatar
Intern
Intern
Joined: 25 May 2012
Posts: 4
Own Kudos [?]: 19 [1]
Given Kudos: 0
Location: United States
Concentration: Finance
WE:Corporate Finance (Non-Profit and Government)
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
1
Kudos
You can use this way if you are uncomfortable multiplying by decimals:

Original Amount:
Using this percent change formula: NA = OA(1+/-(p/100))
Our NA = 68 and our percent change = 15% less than
so, 68 = OA(1-(15/100))
68 = OA(85/100)
OA = 80

Final Amount:
Using this percent change formula: NA = OA (1+/-(p/100))(1+/-(p/100)).............
Our NA is the unknown final price
Plug in your original price for OA
NA = 80(1-(15/100))(1+(25/100))
NA = 80(85/100)(125/100)
NA = 85

We use (1-(15/100)) because our sale price is 15% less than original
We use (1+(25/100)) because our final price is 25% more than our sale price

Subtract
85-80=5
D
avatar
SVP
SVP
Joined: 27 Dec 2012
Status:The Best Or Nothing
Posts: 1558
Own Kudos [?]: 7294 [1]
Given Kudos: 193
Location: India
Concentration: General Management, Technology
WE:Information Technology (Computer Software)
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
1
Bookmarks
Let original price = x
Price with 15% disc = 85x/100................. (1)
Increase of 25% on (1) = 85x/100 * 5/4.................... (2)

From the information given, 85x/100 = 68, so x = 80
Placing value of x in (2) = 85
Difference = 85-80 = 5
Senior Manager
Senior Manager
Joined: 10 Jan 2013
Posts: 266
Own Kudos [?]: 167 [0]
Given Kudos: 201
Location: India
Concentration: General Management, Strategy
GRE 1: Q163 V155
GPA: 3.95
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
espa wrote:
Cindy has her eye on a sundress but thinks it is too expensive. It goes on sale for 15% less than the original price. Before Cindy can buy the dress, however, the store raises the new price by 25%. If the dress cost $68 after it went on sale for 15% off, what is the difference between the original price and the final price?

A. $0.00
B. $1.00
C. $3.40
D. $5.00
E. $6.80


My Approach:

given --
let x be the original price

.85x = 68
x =80

new price = 68*1.25 = 85

difference = 85-80 = 5
Senior Manager
Senior Manager
Joined: 05 Jul 2018
Status:Current student at IIMB
Affiliations: IIM Bangalore
Posts: 378
Own Kudos [?]: 405 [0]
Given Kudos: 326
Location: India
Concentration: General Management, Technology
GMAT 1: 600 Q47 V26
GRE 1: Q162 V149
GPA: 3.6
WE:Information Technology (Consulting)
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
Let original price be x

After a discount of 15%
0.85*x=68
x=(68*100)/85 = (68*20)/17= (4*20)=80

After an increase of 25% on $68 price, the price becomes, 1.25*68= 5/4*68= 5*17 = $85
Difference between original price x=$80 and the final price of $85 is $5

Hence, the answer is D
Manager
Manager
Joined: 27 Nov 2018
Posts: 57
Own Kudos [?]: 31 [0]
Given Kudos: 70
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
espa wrote:
Cindy has her eye on a sundress but thinks it is too expensive. It goes on sale for 15% less than the original price. Before Cindy can buy the dress, however, the store raises the new price by 25%. If the dress cost $68 after it went on sale for 15% off, what is the difference between the original price and the final price?

A. $0.00
B. $1.00
C. $3.40
D. $5.00
E. $6.80


For me the learning from this question is:
"I should remember the Table of 17 else it will take more time to solve this problem".

Other important thing is that the concept of % should be clear.
>Here when we say the product is on sale for 15%, this implies the cost of product after discount is 85% of actual cost. => 0.85 x Original cost.
>Next, 25% increase in price is equal to 1.25 x Original cost (in case of above question- $68 on which the increase of 25% was applied)... Hit KUDOS if my concept behind solving this problem helped you understand the question & solution too.
Current Student
Joined: 04 Sep 2017
Status:Booth 1Y
Posts: 278
Own Kudos [?]: 1176 [2]
Given Kudos: 228
Location: United States (IL)
Concentration: Technology, Leadership
GMAT 1: 690 Q44 V41
GMAT 2: 730 Q50 V38
GPA: 3.62
WE:Sales (Computer Software)
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
2
Bookmarks
espa wrote:
Cindy has her eye on a sundress but thinks it is too expensive. It goes on sale for 15% less than the original price. Before Cindy can buy the dress, however, the store raises the new price by 25%. If the dress cost $68 after it went on sale for 15% off, what is the difference between the original price and the final price?

A. $0.00
B. $1.00
C. $3.40
D. $5.00
E. $6.80


This is a question that tries to suck you into doing long and meaningless long-division. We never need to do that on the gmat.

Solving for Original Price

Given: Original Price * 85/100 = 68.

Calculate with fractions rather than decimals. We should know 85/100 = 17/20.

Original Price = \(\frac{20}{17}\) * 68

But before we multiply 68*20, it may be helpful to prime factorize 68 or 20.

68=2*34 = 2*2*17....... aha! We'll be able to cancel out our 17.

\(\frac{2*2*17*20}{17}\) = 2*2*20 = 80

Solving for Final Price

68 * \(\frac{5}{4}\) = \(\frac{2*2*17*5}{4}\) = 17*5 = 85
GMAT Club Legend
GMAT Club Legend
Joined: 18 Aug 2017
Status:You learn more from failure than from success.
Posts: 7990
Own Kudos [?]: 4228 [0]
Given Kudos: 243
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1:
545 Q79 V79 DI73
GPA: 4
WE:Marketing (Energy and Utilities)
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
espa wrote:
Cindy has her eye on a sundress but thinks it is too expensive. It goes on sale for 15% less than the original price. Before Cindy can buy the dress, however, the store raises the new price by 25%. If the dress cost $68 after it went on sale for 15% off, what is the difference between the original price and the final price?

A. $0.00
B. $1.00
C. $3.40
D. $5.00
E. $6.80


first find original price of dress
.85*x = 68
x= $80
now we have ; 80*.85*1.25 ; $85
∆ 85-80 ; $5
OPTION D
Target Test Prep Representative
Joined: 14 Oct 2015
Status:Founder & CEO
Affiliations: Target Test Prep
Posts: 19150
Own Kudos [?]: 22655 [0]
Given Kudos: 286
Location: United States (CA)
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
Expert Reply
espa wrote:
Cindy has her eye on a sundress but thinks it is too expensive. It goes on sale for 15% less than the original price. Before Cindy can buy the dress, however, the store raises the new price by 25%. If the dress cost $68 after it went on sale for 15% off, what is the difference between the original price and the final price?

A. $0.00
B. $1.00
C. $3.40
D. $5.00
E. $6.80



We can create the equation in which n = the original price of the dress:

0.85n = 68

n = 68/0.85 = 80 dollars

Thus, the final price is 68 x 1.25 = 85 dollars.

So, the difference between the final an original price is 85 - 80 = 5 dollars.

Answer: D
User avatar
Non-Human User
Joined: 09 Sep 2013
Posts: 33999
Own Kudos [?]: 851 [0]
Given Kudos: 0
Send PM
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
GMAT Club Bot
Re: Cindy has her eye on a sundress but thinks it is too expensi [#permalink]
Moderator:
Math Expert
94383 posts