How many days on average does it take a firm to sell an inventory item if the average inventory is $42,800, the cost of goods sold is 78% of sales, and the yearly sales are $311,400? The profit margin is 6% and the tax rate is 35%.

		a)15.68 days
		b)21.36 days
	c)	40.24 days
	d)	64.32 days
		e)82.03 days