9. Which is not a fixed cost? a. monthly rent of 1,000 contractually specified in a one-year lease b. an insurance premium of 50 per year, paid last month c. an attorney's retainer of 50,000 per year d. a worker's wage of 15 per hour

The correct answer is:<br /><br />d. a worker's wage of $\$ 15$ per hour<br /><br />Explanation:<br /><br />Fixed costs are costs that remain constant regardless of the level of production or sales. They do not change with the level of activity in the business. Examples of fixed costs include:<br /><br />a. Monthly rent of $\$ 1,000$ contractually specified in a one-year lease - This is a fixed cost because the rent remains the same regardless of the level of production or sales.<br /><br />b. An insurance premium of $\$ 50$ per year, paid last month - This is a fixed cost because the insurance premium remains the same regardless of the level of production or sales.<br /><br />c. An attorney's retainer of $\$ 50,000$ per year - This is a fixed cost because the retainer fee remains the same regardless of the level of production or sales.<br /><br />d. A worker's wage of $\$ 15$ per hour - This is not a fixed cost because the wage depends on the number of hours worked, which in turn depends on the level of production or sales. Therefore, the worker's wage is a variable cost, not a fixed cost.