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Covering a Box

GMAT-VFUFDP

A rectangular box needs to be covered in felt for a theater set. The box has side lengths of $x$, $2x$, and $3x$.

If covering the smallest side of the box costs $\$5$, how much does it cost to wrap the entire box?

A

$\$30$

B

$\$40$

C

$\$50$

D

$\$60$

E

$\$65$