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A pest control company sprays insecticide around the perimeter of a 100 ft by 120 ft building. If the spray costs $0.10 per foot, how much did the job cost to the nearest dollar?

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To answer, it is assumed that the building is rectangular so that the perimeter is twice the sum of the dimensions given.
                                Perimeter = 2 x (length + width)
                                                = 2 x (120 ft + 100 ft) = 440 ft
We multiply this by the given cost per foot to determine the total cost of the job. 
                              Total cost = (440 ft)($0.10/ft)
                                              = $44
Thus, the answer is $44. 

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