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A building is constructed using bricks that can be modeled as right rectangular prisms with a dimension of 7\frac{3}{4}7
4
3

in by 3\frac{1}{2}3
2
1

in by 2\frac{1}{2}2
2
1

in. If the bricks cost $0.07 per cubic inch, find the cost of 800 bricks. Round your answer to the nearest cent.

Sagot :

The cost of 800 bricks having dimensions of [tex]7\frac{3}{4} \ by\ 3\frac{1}{2} \ by \ 2\frac{1}{2}[/tex] at a cost of $0.07 per in.³ is $3,797.5

How can the cost of 800 bricks to be used for the building be found?

The dimensions of the brick are;

[tex]\mathbf{7\frac{3}{4} \ by\ 3\frac{1}{2} \ by \ 2\frac{1}{2}}[/tex]

Cost of a cubic inch of brick = $0.07

The volume of 1 brick is therefore;

[tex]Volume \ of \ 1 \ brick \ V_1= 7\frac{3}{4} \ \times \ 3\frac{1}{2} \ \times \ 2\frac{1}{2} = \mathbf{67\frac{13}{16}}[/tex]

The volume occupied by 800 bricks is therefore;

[tex]Volume \ of \ 800 \ bricks \ V_{800} = 67\frac{13}{16} \times 800 =\mathbf{ 54250}[/tex]

Given that the dimensions of the bricks are in inches, the volume of 800 bricks is therefore;

V₈₀₀ = 54,250 in.³

The cost of 800 bricks is therefore;

Total cost = 54,250 in.³ × $0.07 = $3,797.5

The cost of 800 bricks is $3,797.5

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