A retailer has the following information:

The estimated cost of inventory to be shown on the retailer's January 31, 2019 balance sheet is

$15,000

$16,000

$20,000

December 31, 2018 ending inventory at cost December 31, 2018 ending inventory at retail January 2019 purchases at cost January 2019 purchases at retail selling prices January 2019 sales at regular retail prices $ 15,000 21,000 12,000 15,000 16,000