O The table given below shows the total fixed and variable costs of a firm. O Table 8.3 O O Quantity of Output Total Fixed Cost Total Variable Cost $40 $30 O $40 $44 O $40 $60 O $40 $80 $40 $110 $40 $150 $40 $200 $40 $280 In Table 8.3, the average fixed cost of the first unit of output is _while the average fixed cost of producing 8 units of output is a. $30; $40 O b. $40; $320 O c. $40; $5 O d. $40; $40 O e. $40; $280