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# A merchant paid $300 for a shipment of x identical  Question banks Downloads My Bookmarks Reviews Important topics Author Message Manager Joined: 14 Dec 2005 Posts: 74 Followers: 1 Kudos [?]: 2 [0], given: 0 A merchant paid$300 for a shipment of x identical [#permalink]  26 Feb 2006, 09:41
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A merchant paid $300 for a shipment of x identical calculators. The merchant used 2 of the calculators as demonstrators and sold each of the others for$5 more than the average (arithmetic mean)
cost of the x calculators. If the total revenue from the sale of
the calculators was $120 more than the cost of the shipment, how many calculators were in the shipment? (A) 24 (B) 25 (C) 26 (D) 28 (E) 30 Intern Joined: 08 Jan 2006 Posts: 27 Followers: 0 Kudos [?]: 0 [0], given: 0 Re: Problem Solving Help [#permalink] 26 Feb 2006, 10:19 Avis wrote: A merchant paid$300 for a shipment of x identical calculators.
The merchant used 2 of the calculators as demonstrators and sold
each of the others for $5 more than the average (arithmetic mean) cost of the x calculators. If the total revenue from the sale of the calculators was$120 more than the cost of the shipment, how many
calculators were in the shipment?
(A) 24
(B) 25
(C) 26
(D) 28
(E) 30

E.

(300/x+5)(x-2) = 120+300

Try the easy one e) 30. ((300/30)+5)(30-2)=420
GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5063
Location: Singapore
Followers: 25

Kudos [?]: 226 [0], given: 0

Average cost of the x calculators = 300/x

Merchant sold (x-2) calculators at (300/x + 5) dollars

Profit

(x-2)(300/x + 5) - 300 = 120
(x-2)(300+5x)/x = 420
300x + 5x^2 - 600 - 10x = 420x
5x^2 -130x -600 = 0
x^2 - 26 - 120 = 0
(x-30)(x+4) = 0
x = 30

Ans E
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