17) Monarch Company uses a weighted-average perpetual inventory system, and has the following purchases and sales: anuary 1 January 12 January 20 20 units were purchased at $10 per unit. 12 units were sold. 18 units were purchased at $11 per unit. What is the value of ending inventory? (Round average cost per unit to 2 decimal places, and final answer to the nearest dollar.) A) $278. B) $272. C) $126. D) $398. E) $120. 17)