Total cost of the border: 95.7$
Step-by-step explanation:
In order to find the cost of the border, we have to find the perimeter of the room first.
The room is a rectangle, so its perimeter is given by:
[tex]p=2L+2W[/tex]
where
L is the length
W is the width
For the room in this problem,
L = 21 ft
W = 12 ft
So the perimeter is
[tex]p=2(21)+2(12)=66 ft[/tex]
Now we know that the cost of the border is $1.45 per foot. Since the border is 66 ft, the total cost of the border will the perimeter multiplied by the cost per foot, therefore:
[tex]cost = 1.45 \cdot 66 = 95.7\$[/tex]
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