At a sales volume of 20,000 units, total costs are $55,000. The company's variable cost per unit is $1.50. What should be the total fixed cost at a sales volume of 30,000 units, assuming that is within the relevant range. Is the answer:
A. $25,000,
B. $30,000,
C. $45,000 or
D. Cannot be determined.
Please explain the process for attaining the answer so that Iwill have a better understanding.