A mixed cost contains a variable element and a fixed element.
Option a
Explanation:
Mixed costs are those costs that has both variable and fixed component. Example: operating cost of a machinery includes fixed costs that cannot be changed with other variable costs like fuel, insurance, depreciation, etc.
It is also named as semi-variable costs. And the formula to calculate mixed cost is as follows,
[tex]y=a+b x[/tex]
where,