3) Pencil Company had the following information for the year: Units Cost per Unit Inventory, January 1 0 s2 Inventory Purchases March September November 9 $3 2 $3.50 Inventory, December 31 3 a) How many units did Pencil sell during the year? b) Calculate the dollar value of Pencil's December 31 inventory, as well as Pencil's COGS, using the FIFO method. c) Calculate the dollar value of Pencil's December 31 inventory, as well as Pencil's COGS, using the LIFO method. d) Calculate the dollar value of Pencil's December 31 inventory, as well as Pencil's COGS, using the average cost method