Below is a list of costs. Classify each of them as variable, fixed, or mixed (a combination of variable and fixed components).
a. Cost of raw materials used in producing a firm’s products.
b. Property taxes.
c. Wages of sales staff paid on a salary plus commission basis.
d. Wages of hourly paid production-line workers.
e. Site licence for software.
f. Leasing costs for a delivery truck ($600 per month plus $0.40 per km).
g. Packaging materials for products.
h. Insurance.