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37 votes
37 votes
A certain room is 10ft x 8ft x 9ft (L x W x H). How much would it cost to put adecorative trim around the perimeter of the room if the trim costs $2 per foot?$72

User Doug Amos
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1 Answer

20 votes
20 votes

The perimeter of the room is given by the formula


P=2L+2W

we have

L=10 ft

W=8 ft

substitute


\begin{gathered} P=2(10)+2(8) \\ P=36\text{ ft} \end{gathered}

Multiply the perimeter by the trim cost ($2 per foot)


\begin{gathered} total\text{ cost=36\lparen2\rparen} \\ total\text{ cost=}\$72 \end{gathered}

User MorrisseyJ
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2.6k points