Math CentralQuandaries & Queries


Question from Simo:

I have a piece of plate that is 2500mm x 8000mm x 20mm thick and costs $7693.00

what is the formula to work out what 1000mm x 1000mm is worth?

Hi Simo,

I assume the plate is of uniform thickness so $2500 \times 8000$ square mm cost $\$7693.00.$ Thus the plate costs

\[\frac{\$7693.00}{2500 \times 8000} \mbox{ per square mm.}\]

Hence $1000 \times 1000$ square mm cost

\[\frac{\$7693.00}{2500 \times 8000}\times 1000\times 1000 = \$384.65.\]

I hope this helps,

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