Concept:Use the creditors account to find credit purchases, then apply the stock formula to compute cost of goods sold.Explanation:Let credit purchases be P.Creditors equation: Opening creditors + Purchases − Cash paid = Closing creditors.So, P=780,000−630,000+2,700,000=2,850,000.Cost of goods sold = Opening stock + Purchases − Closing stock.=540,000+2,850,000−480,000.=2,910,000.Answer:N2,910,000 (Option B).