A certain retailer gets a shipment of items the day after his inventory drops below $$\frac{y}{4}$$ items. Each shipment replenishes the retailer's inventory up to the level y, and it is estimated that the retailer, on average, maintains $$\frac{y}{2}$$ in inventory every month throughout the year. The cost of keeping an item in inventory is $0.5 per month. What is the retailer's annual inventory cost.
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A6y
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B3y
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C$$\frac{3y}{2}$$
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D$$\frac{y}{2}$$
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E$$\frac{y}{12}$$
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正确答案: B