not sure why this isnt 9,750. thanks in advance.

Holly, Inc. has the following information regarding inventories for the quarter ending December 31, 2016: Date Description 10/1/2016 Beginning inventory, October 1 11/2/2016 Purchase 12/1/2016 Purchase 12/22/2016 Purchase Totals Units 500 600 700 Price $5 $6 $7 $8 Amount $2,500 3,600 4,900 5.600 $16,600 200 2500 Holly sold 1.500 units during the quarter at a price of $10.00 per unit. Holly uses the weighted average method of inventory costing with the periodic inventory system. Determine the cost of goods sold for the quarter ending December 31, 2016. (Do Not enter dollar signs.) Selected Answer: 9,750 Correct Answer: 9,960 Answer range +/-O (9960 - 9960)