he following data pertains to activity and utility cost for two recent periods: Activity level (units) 8,000 5,000 Utility cost $8,000 $6,500 Utility cost is a mixed cost with both fixed and variable components. Using the high-low method, the cost formula for utility cost is: Y = $1.00 X Y = $1.25 X Y = $4,000 + $0.50 X Y = $1,500 + $1.25 X