A certain firm produces and sells staplers.Last year, it produced 7,000 staplers and sold each stapler for $9.In producing the 7,000 staplers, it incurred variable costs of $25,000 and a total cost of $45,000.

1.The firm's fixed costs amounted to

a.$7,000

b.$20,000

c.$21,000

d.$45,000

e.$63,000

2.In producing the 7,000 staplers, the firm's average fixed cost was

a.$1.19

b.$1.32

c.$2.21

d.$2.43

e.$2.86

3.In producing the 7,000 staplers, the firm's average variable cost was

a.$2.43

b.$3.57

c.$5.25

d.$6.99

e.$7.21

4.In producing the 7,000 staplers, the firm's average total cost was

a.$2.29

b.$5.17

c.$6.29

d.$6.43

e.$7.17

5.In producing the 7,000 staplers, the firm's total profit was

a.-$9,000

b.-$1,000

c.$8,000

d.$11,000

e.$17,000

f.$18,000

g.$21,000