ABC and XYZ Companies have the following sales, variable cost, and fixed cost. ABC XYZ Sales $50,000 $50,000 Variable Costs $10,000 $30,000 Fixed Costs $30,000 $10,000 If sales increase by $10,000 at each company, then: a. ABC profits will increase by $2,000. b. XYZ profits will increase by $4,000. c. ABC and XYZ profits will increase by $4,000 and $6,000. d. XYZ profits will increase by $8,000