can someone PLEASE HELP WITH BOTH? i'll rate your answer

Required information The following information applies to the questions displayed below. The Shirt Shop had the following transactions for T-shirts for 2018, its first year of operations: Jan. 20 Purchased Apr. 21 Purchased July 25 Purchased Sept. 19 Purchased 330 units $10 $3,300 -88 210 units $132,730 840 80 units$11 60 units $14 - During the year, The Shirt Shop sold 520 T-shirts for $19 each. b. Compute the difference in gross margin between the FIFO and LIFO cost flow assumptions FIFO LIFO Difference Gross margin Required information The following information applies to the questions displayed below The following information pertains to the inventory of Parvin Company: Jan. 1 Beginning inventory Apr. 1 Purchased Oct. 1 Purchased 00 units $21 2,500 units $26 1,000 units $27 During 2018, Parvin sold 3,400 units of inventory at $45 per unit and incurred $18,500 of operating expenses. Parvin currently uses the FIFO method but is considering a change to LIFO. All transactions are cash transactions. Assume a 30 percent income tax rate. Parvin started the period with cash of $117,500, inventory of $10,500, common stock of $105,000, and retained earnings of $23,000. b. Determine the amount of income tax that Parvin would pay using each cost flow method Answer is not complete. FIFO LIFO Income tax S 9,600