The cost to manufacture a product is proportional to the quantity produced, with a cost of $270000 dollars per day when 900 items are produced. The cost to store n items is proportional to the square of n, with a daily storage cost of $6480 dollars when 900 items are stored. In addition, there is a fixed daily cost of $4000. The total daily cost, C when producing and storing n items is the sum of production, storage and fixed costs.
Write a formula for Q as a function of n.
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