You an acoountant for Sgujana Traders, a small manufacturing frm specialising in providing big retail stores with shelving materials. At the end of its financial year end 31 December 2017, Sgujana Traders had the following opening inventory and purchases. Required: 4.1 Determine the cost of inventory on December 31, 2017, using the perpetual inventory system and each of the folowing inventory costing methods: (15) A) First-in, first-cut B) Last-in, first-out C) Weighted average (round weighted average cost per unit to two decimal places) 4.2 Determine the cost of inventory on December 31, 2017, using the periodic inventory system and each of the folowing inventory costing methods: (5) A) First-in, first-out B) Lastin, first-out C) Weighted average (round weighted average cost per unit to two decimal places)