Let's denote the cost per square foot from Company B as \( x \). According to the problem, the cost per square foot from Company A is \( x - 0.15 \).
Now, let's calculate the total cost for 1,200 square feet from both companies:
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The total cost from Company A: \[ \text{Total Cost A} = 1200 \times (x - 0.15) = 1200x - 180 \]
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The total cost from Company B: \[ \text{Total Cost B} = 1200 \times x = 1200x \]
Now, to find the difference in cost between the two companies: \[ \text{Difference} = \text{Total Cost B} - \text{Total Cost A} = 1200x - (1200x - 180) = 180 \]
Since Company B is the one with the higher cost, we can conclude that:
Company A is cheaper by $180.
Thus, the correct answer is: Company A is cheaper by $180.