Brief Exercise 9-10 Waterway Inc. had beginning inventory of $11,600 at cost and $21,800 at retail. Net purchases were $125,641 at cost and $167,100 at retail. Net markups were $10,000, net markdowns were $7,700, and sales revenue was $146,900. Compute ending inventory at cost using the conventional retail method. (Round ratios for computational purposes to o decimal places, e.g. 78% and final answer to o decimal places, e.g. 28,987.) Ending inventory using the conventional retail method tl