Let’s denote the price per square foot from Company B as \( x \). According to the problem, the price per square foot from Company A is \( x - 0.15 \).
Now, we can calculate the total costs for 1,200 square feet of carpet from both companies:
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Total cost from Company A:
\[ \text{Cost from A} = 1,200 \times (x - 0.15) = 1,200x - 180 \] -
Total cost from Company B:
\[ \text{Cost from B} = 1,200 \times x = 1,200x \]
Next, we compare the total costs:
\[ \text{Cost from B} - \text{Cost from A} = 1,200x - (1,200x - 180) = 180 \]
This calculation shows that Company A is cheaper than Company B by $180.
Therefore, the correct answer is: Company A is cheaper by $180.