The average total cost of producing cell phones in a factory is $20 at the current output level of 100 units per week. If fixed cost is $1,600 per

The average total cost of producing cell phones in a factory is $20 at the current output level of 100 units per week. If fixed cost is $1,600 per week, what is the average variable cost?

a. cheese.

b. average fixed cost is $20.

c. average variable cost is $4.

d. variable cost is $2,000.

e. total cost is $3,200.