I need help with C

A firm is about to undertake the manufacture of a product, and it is weighing the process configuration options. There are two intermittent processes under consideration, as well as a repetitive focus. The larger intermittent process has fixed costs of $15,500 per month and variable costs of $3 per unit. A repetitive focus plant has fixed costs of $26,000 per month and variable costs of $2 per unit. The smaller intermittent process has fixed costs of $7,500 per month and variable costs of $7 per unit. A. What is the range of production volume for which the larger intermittent process is most economical? B. What is the range of production volume for which the smaller intermittent process is most economical? C. What is the range of production volume for which the repetitive process is most economical? D. What is the total cost of producing 16,250 units of product using the most economical process alternative? 0 to 2000 10500 or more 3700 to 10500 8750 or more