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Natcher Corporation's accounts receivable at the end of Year 2 was $126,000 and its accounts receivable at the end of Year 1 was $130,000. The company's inventory at the end of Year 2 was $127,000 and its inventory at the end of Year 1 was $120,000. Sales, all on account, amounted to $1,380,000 in Year 2. Cost of goods sold amounted to $800,000 in Year 2. The company's operating cycle for Year 2 is closest to: