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The architects of a certain type of building estimate construction cos

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The architects of a certain type of building estimate construction cos  [#permalink]

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New post 23 May 2018, 07:20
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The architects of a certain type of building estimate construction costs to be $2.0 million per floor for each of the first 5 floors, $2.5 million per floor for each of the next 3 floors, and $3.5 million per floor for any additional floors. What would the architects estimate the construction costs to be for a building of this type with 10 floors?


A. $23.0 million

B. $23.5 million

C. $24.0 million

D. $24.5 million

E. $25.0 million

Source: Default Gmat prep.

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Re: The architects of a certain type of building estimate construction cos  [#permalink]

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New post 23 May 2018, 08:06
adkikani wrote:
The architects of a certain type of building estimate construction costs to be $2.0 million per floor for each of the first 5 floors, $2.5 million per floor for each of the next 3 floors, and $3.5 million per floor for any additional floors. What would the architects estimate the construction costs to be for a building of this type with 10 floors?

A. $23.0 million

B. $23.5 million

C. $24.0 million

D. $24.5 million

E. $25.0 million

Source: Default Gmat prep.


2*5 + 2.5*3 + 3.5*2

= 10 + 7.50 + 7.00

= 24.50 , Answer must be (D)

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Re: The architects of a certain type of building estimate construction cos  [#permalink]

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New post 21 Jan 2019, 19:04
adkikani wrote:
The architects of a certain type of building estimate construction costs to be $2.0 million per floor for each of the first 5 floors, $2.5 million per floor for each of the next 3 floors, and $3.5 million per floor for any additional floors. What would the architects estimate the construction costs to be for a building of this type with 10 floors?


A. $23.0 million

B. $23.5 million

C. $24.0 million

D. $24.5 million

E. $25.0 million

Source: Default Gmat prep.


For a 10-floor building, the cost is:

2 million x 5 + 2.5 million x 3 + 3.5 million x 2 = 10 + 7.5 + 7 = $24.5 million.

Answer: D
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Re: The architects of a certain type of building estimate construction cos  [#permalink]

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New post 11 Apr 2019, 11:18
Hi All,

We're told that the architects of a certain type of building estimate construction costs to be $2.0 million per floor for each of the first 5 floors, $2.5 million per floor for each of the next 3 floors, and $3.5 million per floor for any additional floors. We're asked what the architects would estimate the construction costs to be for a building of this type with 10 floors. This question is ultimately just about Arithmetic, but since the answers are relatively 'close together', we have to be careful about doing detailed work (or we might get one of the wrong answers).

According to the given information:
Each of the first 5 floors costs $2 million each --> (5)($2 million) = $10 million
Each of the next 3 floors costs $2.5 million each --> (3)($2.5 million) = $7.5 million
Each additional floor costs $3.5 million each --> (2)($3.5million) = $7 million

Total = $10 million + $7.5 million + $7 million = $24.5 million

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Re: The architects of a certain type of building estimate construction cos   [#permalink] 11 Apr 2019, 11:18
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