Given the Following Information,determine the Cost of Goods Sold at December

Multiple Choice

Given the following information,determine the cost of goods sold at December 31 using the Weighted Average periodic inventory method.
December 2: 5 units were purchased at $7 per unit.
December 9: 10 units were purchased at $9.40 per unit.
December 11: 12 units were sold at $35 per unit
December 15: 20 units were purchased at $10.15 per unit
December 22: 18 units were sold at $35 per unit

A) $282.15
B) $332.10
C) $284.70
D) $290.70
E) $210.30