Ambiguous inventory valuation prevents exact calculation Steps:

• Calculate COGS at cost = Sales / 1.2 = $500,000 / 1.2 =$416,667.
• Calculate average inventory = ($300,000 +$270,000) / 2 = $285,000.
• If inventory at cost, days = 365 × $285,000 /$416,667 ≈ 250 days.
• If inventory at retail, adjust to cost average = $285,000 × (100/120) =$237,500; days = 365 × $237,500 /$416,667 ≈ 208 days. Not enough information.

Final answer: Not enough information.