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Question 7 (2 points) In September, 7,000 machine hours were run at the high level of activity and power costs were $18,000. In February, 2,000 machine hours were run (a month of low activity), and power costs amounted to $9,000. Using the high-low method, which would be the estimated fixed cost element of power costs? Oa) $5.400 b) $9.000 c) $12,600 O d) $18.000