please help I want to makw sure I got the chart right

Cost behavior Flaherty Accounting Services pays $800 per month for a tax preparation software license. In addition, variable charges incurred average 59 for every tax return the firm prepares. a. Determine the total cost and the cost per unit if the firm expects to prepare the following number of tax returns in March: Note: Round amounts to two decimal places. 1. 2 3. 200 No. of Tax Returns Total Cost Cost per Tax Return 80 7.920 99 $ 9,000 $ 45 320 10,0805 31.5 b. The owner of Flaherty Accounting Services wants to earn a margin (excluding any other direct costs) on tax returns of $6.000 during March If 80 returns are prepared, what tax return preparation fee should be charged? $0 c. If the fee is charged in part band 320 returns are prepared, what is the margin in March? $0