The following data pertains to activity and utility cost for two recent periods: Activity level (units) Utility cost 15,000 12,000 $24,750 $21,000 Utility cost is a mixed cost with both fixed and variable components. Using the high-low method, the cost formula for utility cost is: (Round your intermediate calculations to 2 decimal places.) Multiple Choice Y = $3,750 + $1.75 X Y = $1.65 X Y = $6,000+ $1.25 X Y = $1.75 X