Beginning inventory 15 units @ $6 per unit, First purchase 30 units @ $7 per unit First sale 25 units Second purchase 35 units @ $8 per unit Second sale 40 units Third purchase 20 units @ $9 per unit What is the value of the ending inventory using a perpetual inventory system with the LIFO costing method? A) $270 B) $285 C) $300 D) $490 E) None of the above