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A car with all available options costs $18,000, an increase

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GMAT Club Legend
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A car with all available options costs $18,000, an increase [#permalink] New post 28 Dec 2016, 15:06
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Question Stats:

78% (00:29) correct 21% (00:18) wrong based on 14 sessions
A car with all available options costs $18,000, an increase of 20% from the base price of the car.

Quantity A
Quantity B
The base price of the car
$14,400


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.



Drill 2
Question: 1
Page: 314
[Reveal] Spoiler: OA

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Last edited by Carcass on 08 May 2018, 11:28, edited 1 time in total.
Edited the OA
GMAT Club Legend
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Re: A car with all available options costs $18,000, an increase [#permalink] New post 28 Dec 2016, 15:16
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Explanation

The question asks for a percent increase from the original price; be careful not to find 20% of $18,000, and reduce the higher total ($18,000) by that amount. Instead, you’ll need to find the amount that yields the higher total, when increased by 20%, though, it’s much easier to just increase the price in Quantity B and compare it to the total in the problem: 10% of $14,400 is $1,440, so 20% must be $2,880; adding this to the base price of $14,400 yields a total of $17,280. That’s smaller than what you were looking for, so Quantity A is greater.
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Re: A car with all available options costs $18,000, an increase [#permalink] New post 25 Jan 2017, 11:53
Expert's post
sandy wrote:
A car with all available options costs $18,000, an increase of 20% from the base price of the car.

Quantity A
Quantity B
The base price of the car
$14,400




Let B = base price

A car with all available options costs $18,000, an increase of 20% from the base price of the car
In other words, when we increase the base price by 20%, we get a new price of $18,000
Increasing a value by 20% is equivalent to multiplying that value by 1.20

So, we can write: 1.20B = $18,000
Divide both sides by 1.2 to get: B = $15,000

We get:
Quantity A: $15,000
Quantity B: $14,400

Answer: A
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Re: A car with all available options costs $18,000, an increase [#permalink] New post 08 May 2018, 07:26
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@GreenlightTestPrep, Spoiler Answer section lists answer as D, whereas the answers explained were A.

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Re: A car with all available options costs $18,000, an increase [#permalink] New post 08 May 2018, 11:29
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Fixed. Thank you.

+ 1 kudo.

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Re: A car with all available options costs $18,000, an increase   [#permalink] 08 May 2018, 11:29
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