Last visit was: 14 Jul 2025, 23:42 It is currently 14 Jul 2025, 23:42
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
User avatar
theGame001
Joined: 13 Jul 2013
Last visit: 27 Jul 2015
Posts: 52
Own Kudos:
47
 [10]
Given Kudos: 21
GMAT 1: 570 Q46 V24
GMAT 1: 570 Q46 V24
Posts: 52
Kudos: 47
 [10]
1
Kudos
Add Kudos
9
Bookmarks
Bookmark this Post
User avatar
mau5
User avatar
Verbal Forum Moderator
Joined: 10 Oct 2012
Last visit: 31 Dec 2024
Posts: 479
Own Kudos:
3,278
 [2]
Given Kudos: 141
Posts: 479
Kudos: 3,278
 [2]
1
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
User avatar
kusena
Joined: 14 Aug 2013
Last visit: 30 Dec 2014
Posts: 23
Own Kudos:
164
 [1]
Given Kudos: 4
Location: United States
Concentration: Finance, Strategy
GMAT Date: 10-31-2013
GPA: 3.2
WE:Consulting (Consumer Electronics)
Posts: 23
Kudos: 164
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Skag55
Joined: 26 Feb 2013
Last visit: 01 Aug 2014
Posts: 122
Own Kudos:
Given Kudos: 25
Posts: 122
Kudos: 189
Kudos
Add Kudos
Bookmarks
Bookmark this Post
I thought we need to multiply b^4 and did 2(b^4) and answered wrong. :?
User avatar
theGame001
Joined: 13 Jul 2013
Last visit: 27 Jul 2015
Posts: 52
Own Kudos:
Given Kudos: 21
GMAT 1: 570 Q46 V24
GMAT 1: 570 Q46 V24
Posts: 52
Kudos: 47
Kudos
Add Kudos
Bookmarks
Bookmark this Post
mau5
theGame001
Cost is expressed by the formula tb^4. If b is doubled, the new cost is what percent
of the original cost?

(A) 200
(B) 600
(C)800
(D) 1600
(E) 50

I read the explanation in Manhattan but cant relate to it.

I worked it out this way

Assume,
t=1
b=2

Original = (1*2)^4= 16
New= (1*2*2)^4 = 256

% change= (change/Original)*100
=(240/16)*100
=1500

Where am I going wrong?

Thanks

The question asks for the relative percent b/w the new cost and the final cost, that is \(\frac{256}{16}*100\) and NOT the precent increase/decrease.

For example, initial cost=1 , final cost = 2, and the question asks what percent of the original cost is the final cost : \(\frac{2}{1}*100\) = 200%

Again, if the question asks, what is the percent increase between the final and the initial cost : \(\frac{2-1}{1}*100\) = 100%

Ahhhh, okay. Thanks, I clearly misinterpreted the question.
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 14 July 2025
Posts: 102,576
Own Kudos:
Given Kudos: 98,190
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,576
Kudos: 741,459
Kudos
Add Kudos
Bookmarks
Bookmark this Post
theGame001
Cost is expressed by the formula tb^4. If b is doubled, the new cost is what percent of the original cost?

(A) 200
(B) 600
(C) 800
(D) 1600
(E) 50

I read the explanation in Manhattan but cant relate to it.

I worked it out this way

Assume,
t=1
b=2

Original = (1*2)^4= 16
New= (1*2*2)^4 = 256

% change= (change/Original)*100
=(240/16)*100
=1500

Where am I going wrong?

Thanks

The point is that 16tb^4 is 1600% of tb^4 but 16tb^4 is 1500% greater than tb^4.
User avatar
saynchalk
Joined: 17 Sep 2023
Last visit: 13 Jul 2025
Posts: 204
Own Kudos:
Given Kudos: 835
Status:Always questioning myself
Location: India
Concentration: General Management, International Business
Schools: CBS
GMAT Focus 1: 525 Q74 V82 DI72
GPA: 3.1
WE:Sales (Computer Software)
Schools: CBS
GMAT Focus 1: 525 Q74 V82 DI72
Posts: 204
Kudos: 193
Kudos
Add Kudos
Bookmarks
Bookmark this Post
someone solve it please
Moderators:
Math Expert
102576 posts
PS Forum Moderator
691 posts