suppose that ralph lauren company reports the following for the month of june. june $1$ inventory $400$ unit cost $$4$ total cost $$1600$ june $12$ purchase $700$ unit cost $6$ total cost $420023$ purchase $900$ units $8$ total cost $720030$ inventory $430.$ calculate the cost of the ending inventory and the cost of goods sold for each cost flow assumptions, using a perpetual inventory system. assume a sale of $770$ units occurred on june $15$ for a selling price of and a sale of $800$ units on june $27$ for $$9$