A Company. produces a single product and has a manufacturing capacity of up to 15,000 units per year. Production cost data for ABC's last two months of operation were as follows: November December Production in units: 6,000 8,000 Production costs incurred: $20,000 $24,000 Using the high-low method, calculate ABC's monthly production cost formula: Select one: O a. Total production costs = $2(x) + $11,000 O b. Total production costs = $0.5(x) + $6,000 O c. Cannot be determined O d. Total production costs = $2(x) + $8,000