NEW HERE? LEARN MORE
closeclose
Last visit was: 25 Apr 2024, 14:12 It is currently 25 Apr 2024, 14:12
Decision Tracker
My Rewards
New posts
New comers' posts

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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel

The cost of delivery for an order of desk chairs was $10.00

SORT BY:
Date
Kudos
Tags:
Find Similar Topics 
Show Tags
Hide Tags
avatar
ruturajp
Intern
Intern
Joined: 05 Oct 2011
Posts: 31
Own Kudos [?]: 578 [9]
Given Kudos: 16
Send PM
The cost of delivery for an order of desk chairs was $10.00 [#permalink] New post   Updated on: 31 Jul 2014, 02:48
2
Kudos
7
Bookmarks
00:00
A
B
C
D
E

Difficulty:

25% (medium)

Question Stats:

77% (01:56) correct 23% (01:52) wrong based on 223 sessions
Hide Show timer Statistics
The cost of delivery for an order of desk chairs was $10.00 for the first chair, and $1.00 for each additional chair in the order. If an office manager placed an order for n desk chairs, is n > 24 ?

(1) The delivery cost for the order totalled more than $30.00.
(2) The average (arithmetic mean) delivery cost of the n chairs was $1.36.

OPEN DISCUSSION OF THIS QUESTION IS HERE: the-cost-of-delivery-for-an-order-of-desk-chairs-was-124235.html
ShowHide Answer
Official Answer
B

Originally posted by ruturajp on 06 Dec 2011, 02:21.
Last edited by Bunuel on 31 Jul 2014, 02:48, edited 1 time in total.
Renamed the topic and edited the question.
User avatar
jamifahad
Senior Manager
Senior Manager
Joined: 03 Mar 2010
Posts: 259
Own Kudos [?]: 1371 [0]
Given Kudos: 22
Schools: Simon '16 (M$)
Send PM
Re: The cost of delivery for an order of desk chairs was $10.00 [#permalink] New post   06 Dec 2011, 02:33
Stmt1: take n=25. total cost= 10+24(1)= 34 which is greater than 30.
Is n>24. Yes.
Take n=22. total cost=10+21(1)=31 which is greater than 30.
Is n>24. No.
Insufficient.

Stmt2: The average (arithmetic mean) delivery cost of the n chairs was $1.36.
[10+ (n-1)1]/n = 1.36
You will get ONE value of n. That value can be greater than 24 or less than 24 and accordingly you can answer either YES or NO.

Sufficient.

OA B.
User avatar
BDSunDevil
Manager
Manager
Joined: 13 May 2011
Posts: 144
Own Kudos [?]: 508 [0]
Given Kudos: 11
Concentration: Supply Chain, Logistics
WE 1: IT 1 Yr
WE 2: Supply Chain 5 Yrs
Send PM
Re: The cost of delivery for an order of desk chairs was $10.00 [#permalink] New post   06 Dec 2011, 07:18
rephrasing the question is cost>33? [ cost of 24 chair will be 10+23=33]

1. cost> 30 . can be 31 or 34. Not Sufficient
2. Sum(#of chair)/n= 1.36
{10+(n-1)*1}/n=1.36
we can solve for n. Sufficient
B
avatar
Vijayeta
Intern
Intern
Joined: 14 Jan 2014
Posts: 9
Own Kudos [?]: 232 [0]
Given Kudos: 60
Send PM
GMAT ToolKit User
Re: The cost of delivery for an order of desk chairs was $10.00 [#permalink] New post   31 Jul 2014, 01:57
Please explain it.
User avatar
L
Bunuel
Math Expert
Joined: 02 Sep 2009
Posts: 92915
Own Kudos [?]: 619012 [3]
Given Kudos: 81595
Send PM
CAT Tests Forum Quiz Mode
Re: The cost of delivery for an order of desk chairs was $10.00 [#permalink] New post   31 Jul 2014, 02:49
1
Kudos
2
Bookmarks
Expert Reply
The cost of delivery for an order of desk chairs was $10.00 for the first chair, and $1.00 for each additional chair in the order. If an office manager placed an order for n desk chairs, is n > 24 ?

According to the rule given in the stem the cost of delivery for n chairs is $10+$1*(n-1)=9+n.

(1) The delivery cost for the order totalled more than $30.00 --> 9+n>30 --> n>21, so n may or may not be more than 24. not sufficient.

(2) The average (arithmetic mean) delivery cost of the n chairs was $1.36 --> (average cost)=(total cost)/(# of chairs)=(9+n)/n. We are told that (9+n)/n=1.36 --> we can find the exact numerical value of n. Sufficient.

Answer: B.

Similar questions to practice:
DS:
a-certain-store-sells-chairs-individually-or-in-sets-of-130903.html
a-taxi-company-charges-f-cents-for-the-first-mile-of-the-139875.html
for-each-order-a-certain-company-charges-a-delivery-fee-d-143882.html
for-each-landscaping-job-that-takes-more-than-4-hours-a-85026.html
beth-s-bank-charges-a-service-fee-on-a-regular-checking-89718.html
to-instal-a-cable-television-in-a-home-a-certain-cable-comp-131751.html
the-cost-of-delivery-for-an-order-of-desk-chairs-was-124235.html
for-each-customer-a-bakery-charges-p-dollars-for-the-first-35469.html
a-taxi-company-charges-f-cents-for-the-first-mile-of-the-139875.html
if-bob-produces-36-or-fewer-in-a-week-he-is-paid-x-dollars-88217.html

PS:
to-mail-a-package-the-rate-is-x-cents-for-the-first-pound-144264.html
if-a-taxicab-charges-x-cents-for-the-first-1-9-mile-and-x-97525.html
louie-takes-out-a-three-month-loan-of-1000-the-lender-101506.html
a-certain-telephone-company-offers-two-plans-a-and-b-under-126763.html
a-certain-taxi-company-charges-3-10-for-the-first-1-5-of-a-56649.html
an-auction-house-charges-a-commission-of-15-on-the-first-133397.html
to-mail-a-package-the-rate-is-x-cents-for-the-first-pound-144264.html
at-a-certain-supplier-a-machine-of-type-a-costs-20-000-and-97410.html
for-every-order-a-certain-mail-order-company-charges-a-ship-149154.html
last-month-a-certain-music-club-offered-a-discount-to-134496.html
each-week-harry-is-paid-x-dollars-per-hour-for-the-first-131475.html
a-certain-library-assesses-fines-for-overdue-books-as-follow-127007.html
a-certain-company-retirement-plan-has-a-rule-of-109708.html
according-to-the-table-of-shipping-rates-above-86627.html
the-cost-of-a-certain-phone-call-was-0-75-for-the-first-164658.html

OPEN DISCUSSION OF THIS QUESTION IS HERE: the-cost-of-delivery-for-an-order-of-desk-chairs-was-124235.html
GMAT Club Bot
gmatclubot
Re: The cost of delivery for an order of desk chairs was $10.00 [#permalink]
31 Jul 2014, 02:49
Moderator:
Bunuel
Math Expert
92915 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne
Main navigation
GMAT Resources
Partners
MBA Resources
www.gmac.com|www.mba.com | | GMAT Club Rules | Terms and Conditions