Big Box Store has operated with a 30% average gross profit ratio for a number of years. It had $114,000 in sales during the second quarter of this year. If it began the quarter with $ 19, 400 of inventory at cost and purchased $73, 400 of inventory during the quarter, its estimated ending inventory by the gross profit method is: $34, 200. $31, 200. $19, 400. $23, 940. $13,000