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#### karush

##### Well-known member

- Jan 31, 2012

- 2,725

$C=100\left(\frac{200}{x^2}+\frac{x}{x+30}\right),\ x\ge1$

Where $C$ is measured in thousands of dollars and $x$ is the order size in hundreds.

Find the order size that minimizes the cost. [Hint: use the roots feature of a graphing utility]

I took the derivative of this and set it to zero but did not get the ans of $4045$ units

from the graph it looks like the min would be 40.45 then times 100 would be the ans

thanks ahead