In the above figure, the Average Total Cost of producing 13 units of output is $ .

Suppose a firm is producing 80

units of output,

incurring a total cost of

If the total product of three workers is 316 units and the total product of four workers is 331 

units, then the marginal

product of the fourth worker is 

If an increase in output from 16 to 20 teapots increases total cost from $1,200 to $1,500, the marginal cost of one of those 4 teapots is $  .

A firm's total fixed cost is $190

. If total cost

is