Warren Company's records reveal the following information regarding its inventory: Beginning inventory was $$100,000$ at cost and $160,000$ at retail. Purchases during the year were $$300,000$ at cost and $$500,000$ at retail. Net markups were $$10,000$ and net markdowns, $$20,000.$ Assuming the retail inventory method is used to approximate average costs, what is the cost to retail percentage?