Chapter 18, Problem 1E

I need help with this general accounting question using standard accounting techniques.

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At the high level of activity in July, 9,500 machine hours were run, and energy costs amounted to $28,500. In January, a month of low activity, 4,200 machine hours were run, and energy costs totaled $16,800. Using the high-low method, what is the estimated fixed cost element of energy costs?