Question: A rectangular vault is to be constructed on an existing floor at a bank so as to enclose a volume of 485 cubic meters. The

A rectangular vault is to be constructed on an existing floor at a bank so as to enclose a
volume of 485 cubic meters. The cost per square meter of materials is $2,000 for the ceiling,
$9,000 for the wall with the door and $3,000 for the other three walls. The minimized cost
of the vault rounded to the nearest $1,000 dollars is:
a. $964,000
b. $971,000
c. $982,000
d. $993,000

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