Math  /  Geometry

QuestionAs part of his sinister plan, Dr. Evil decides to mail Mini-Me to Austin Powers, in order to conduct his dirty work. The box to be used for shipment must be a rectangular storage container with a volume of 10ft310 \mathrm{ft}^{3}. The top and bottom of the box will be square, but the sides will be somewhat longer. In addition, a different material will be used for the top and bottom. Dr. Evil has invented a breathable cardboard that costs $5\$ 5 per square foot (the regular cardboard sides cost only $2\$ 2 per square foot). Design a container for Mini-Me that will meet the volume requirements while minimizing the cost. Unfortunately, Dr. Evil's henchmen (who will eventually build the box) can only measure within half a foot. Rounding your dimensions to the nearest half-foot, what is the volume of the new box and how much will it cost to build?

Studdy Solution
Round x x to the nearest half-foot:
x1.5 x \approx 1.5
Calculate h h using the volume constraint:
h=10x2=101.524.444 h = \frac{10}{x^2} = \frac{10}{1.5^2} \approx 4.444
Round h h to the nearest half-foot:
h4.5 h \approx 4.5
Calculate the new volume:
V=x2h=1.524.5=10.125ft3 V = x^2 \cdot h = 1.5^2 \cdot 4.5 = 10.125 \, \text{ft}^3
Calculate the cost with rounded dimensions:
C=10x2+8xh=10(1.52)+8(1.5)(4.5) C = 10x^2 + 8xh = 10(1.5^2) + 8(1.5)(4.5) =10(2.25)+8(6.75) = 10(2.25) + 8(6.75) =22.5+54 = 22.5 + 54 =76.5dollars = 76.5 \, \text{dollars}
The volume of the new box is 10.125ft3 10.125 \, \text{ft}^3 and the cost to build it is $76.5 \$76.5 .

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