9. Frazier Manufacturing Company uses high- low method to determine mixed cost . The total power cost equation based on prior month machine hours is Y = 100 + 1.5 X Which of the following statement is correct? A. The estimated total power costs is $100/ month B. The estimated fixed cost element of power costs is $100/hour C. The estimated variable cost element of power costs is $1.5/month D. The estimated variable cost element of power costs is $1.5/hour