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Question $19(1\mathrm{.}5$ points$)$ Listen Each A $($finished product$)$ requires $1$ of component B and $2$ of component C$.$ Each B requires $2$ o

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Each

A

$($finished product$)$ requires $1$ of component

B

and $2$ of component

C

$.$ Each

B

requires $2$ of part

D

and $1$ of part

E

; and each

C

requires $1$ of part

D

and $1$ of part

F

$.$ If the demand for product

A

is $30$ units, and there are $10$ units of

B

on hand and none of

C

$,$ how many units of part

D

will be needed?