At an activity level of 8,000 units, its total variable cost is $16,000 and its total fixed cost is $14,000. What would be the total cost (fixed and variable) at an activity level of 10,000 units? Assume that these levels of activity are within the relevant range. O a. $24,000 O b. $34,000 O c. $31,500 O d. $30,000 The following data pertains to activity and maintenance cost for two recent periods: Activity level (units) 8,000 7,375 Maintenance costs $34,000 $31,500 Maintenance cost is a mixed cost with both fixed and variable components. Using the high-low method, the cost formula for maintenance cost is: O a. Y = $2,500 + $4.25 X O b. Y = $4.50 X O c. Y = $2,000 + $4 X od Y = $425 X