In the cost formula example, what are the two components combined to determine the total cost?

• A. Only a fixed base cost
• B. A fixed base cost and a variable labor cost calculated as rate times hours
• C. Only parts cost
• D. Only an hourly wage

Answer: (B)

Total cost is made up of two pieces: a fixed base cost that you pay regardless of how many hours are involved, and a variable labor cost that depends on hours worked. The variable part is calculated as the labor rate times hours. Adding these together gives the total cost. The other options miss one of these essential parts—either leaving out the fixed base or the variable labor component—so they don’t capture how costs change with activity or stay constant.