Farmer Dorr figures that her fixed costs are $2,000, and the relevant portion of her total cost curve is:

                                          Thousands of                   Total Cost

                                          Bushels            (in thousands of dollars)

                                              10                                   10.70

                                              11                                   11.45

                                              12                                   12.25

                                              13                                   13.10

                                              14                                   14.00

                                              15                                   15.00

                                              16                                   16.10

                                              17                                   17.32

                                              18                                   18.75

                                              19                                   20.30

a)   Calculate Farmer Dorr's schedules of average cost, marginal cost, total variable cost, and average variable cost.

b)   If Farmer Dorr is a perfect competitor, what level of output should she produce, if the market price is:

                  (i)  $1.50   (iii) $0.92

                  (ii) $1.00   (iv) $0.82