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# In a certain restaurant, if each soft drink costs the same amount, wha

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Math Expert
Joined: 02 Sep 2009
Posts: 59039
In a certain restaurant, if each soft drink costs the same amount, wha  [#permalink]

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23 Sep 2019, 21:22
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15% (low)

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89% (00:53) correct 11% (01:07) wrong based on 35 sessions

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In a certain restaurant, if each soft drink costs the same amount, what is the cost, excluding sales tax, of 1 soft drink?

(1) The cost, excluding sales tax, of 5 soft drinks is $6.25. (2) The cost, including sales tax, of 3 soft drinks is$4.05.

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Math Expert
Joined: 02 Sep 2009
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Re: In a certain restaurant, if each soft drink costs the same amount, wha  [#permalink]

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23 Sep 2019, 21:22

Official Explanation

(2) The cost, including sales tax, of 3 soft drinks is $4.05.....Two variables one equation....Insufficient OA:A Originally posted by madgmat2019 on 23 Sep 2019, 21:32. Last edited by madgmat2019 on 23 Sep 2019, 22:29, edited 2 times in total. Senior Manager Status: Whatever it takes! Joined: 10 Oct 2018 Posts: 383 GPA: 4 Re: In a certain restaurant, if each soft drink costs the same amount, wha [#permalink] ### Show Tags 23 Sep 2019, 21:46 1 In a certain restaurant, if each soft drink costs the same amount, what is the cost, excluding sales tax, of 1 soft drink? (1) The cost, excluding sales tax, of 5 soft drinks is$6.25.
(2) The cost, including sales tax, of 3 soft drinks is $4.05. Cost (excluding sales tax) =? (1) The cost, excluding sales tax, of 5 soft drinks is$6.25.
Cost * 5 = 6.25
Cost of one drink = 1.25 (excluding sales tax)

SUFFICIENT!

(2) The cost, including sales tax, of 3 soft drinks is $4.05. (Cost + Sales Tax) * 3 = 4.05 (Cost + Sales Tax) of one drink = 4.05/3 =$1.35
But we don't know how much the sales tax is => so can't figure out the price excluding sales tax.

INSUFFICIENT!

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Re: In a certain restaurant, if each soft drink costs the same amount, wha  [#permalink]

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23 Sep 2019, 21:51
1
In a certain restaurant, if each soft drink costs the same amount, what is the cost, excluding sales tax, of 1 soft drink?

(1) The cost, excluding sales tax, of 5 soft drinks is $6.25. Since total amount excluding tax is given along with total number of drinks, we can calculate cost per drink. Cost = $$\frac{6.25}{5}$$ =$1.25
SUFFICIENT.

(2) The cost, including sales tax, of 3 soft drinks is $4.05. Total cost$4.05 includes tax the rate of which is unknown. Hence tax can be 1%, 5%, 10% or may be 25%.
Thus, cost per drink can vary any number of times.

INSUFFICIENT.

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Re: In a certain restaurant, if each soft drink costs the same amount, wha  [#permalink]

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23 Sep 2019, 22:31
1
We are to determine the cost of a soft drink excluding sales tax.

From 1, we know that the cost excluding sales tax of 5 soft drinks is $6.25. Therefore cost per soft drink excluding sales tax = 6.25/5 =$1.05.
Statement 1 is sufficient.

From 2 we know that cost of three soft drink including sales tax is $4.05 This is insufficient because we don’t know the proportion of the amount which is sales tax. The answer is therefore A. Posted from my mobile device GMAT Club Legend Joined: 18 Aug 2017 Posts: 5265 Location: India Concentration: Sustainability, Marketing GPA: 4 WE: Marketing (Energy and Utilities) Re: In a certain restaurant, if each soft drink costs the same amount, wha [#permalink] ### Show Tags 24 Sep 2019, 00:51 given price of each soft drink is same determine ; the cost, excluding sales tax, of 1 soft drink #1 The cost, excluding sales tax, of 5 soft drinks is$6.25.
5*x=6.25
x=1.25 sufficient
#2
The cost, including sales tax, of 3 soft drinks is $4.05 3*x*tax=4.05 price per unit*tax%=1.35 insufficient IMO A In a certain restaurant, if each soft drink costs the same amount, what is the cost, excluding sales tax, of 1 soft drink? (1) The cost, excluding sales tax, of 5 soft drinks is$6.25.
(2) The cost, including sales tax, of 3 soft drinks is $4.05. Director Joined: 24 Nov 2016 Posts: 769 Location: United States Re: In a certain restaurant, if each soft drink costs the same amount, wha [#permalink] ### Show Tags 24 Sep 2019, 04:33 Quote: In a certain restaurant, if each soft drink costs the same amount, what is the cost, excluding sales tax, of 1 soft drink? (1) The cost, excluding sales tax, of 5 soft drinks is$6.25.
(2) The cost, including sales tax, of 3 soft drinks is $4.05. "each soft drink costs the same amount" (1) The cost, excluding sales tax, of 5 soft drinks is$6.25: 6.25/5=1.25 each soft drink, sufic.
(2) The cost, including sales tax, of 3 soft drinks is \$4.05: we don't know sales tax, insufic.

Re: In a certain restaurant, if each soft drink costs the same amount, wha   [#permalink] 24 Sep 2019, 04:33
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