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:d. a worker's wage of 15 \ 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.b. An insurance premium of 50 \ per year - This is a fixed cost because the retainer fee remains the same regardless of the level of production or sales.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.