The following information relates to the inventory of Buffin Limited, a book supplier. (Ignore GST) 2020 Units Unit cost 1 Jan Beginning Inventory 80 $4.00 6 Jan Purchases 120 $4.20 5 Feb Sales at $6.00 per unit 100 17 Mar Purchases 50 $4.40 3 Apr Purchases 60 $4.30 18 May Sales at $6.10 per unit 80 11 Jun Sales at $6.20 per unit 20 Required: 1. Using the perpetual inventory system, determine the cost of the ending inventory and the cost of sales under the FIFO method. (Please complete the inventory template in the answer book and round off calculations to 2 decimal places) (17 marks) 2. Using the periodic inventory system, determine the cost of the ending inventory and cost of sales under the FIFO method. (Round off calculations to 2 decimal places and SHOW ALL CALCULATIONS AND WORKINGS) (5 marks)