Credit Sales = ₹ 1,80,000 (3/4 of Total Sales)
Total Sales = ₹ 2,40,000
Gross Profit = 25% of Cost or 20% of Sales
Gross Profit = ₹ 48,000
Cost of Goods Sold = Net Sales – Gross Profit
Cost of Goods Sold = 2,40,000 – 48,000 = ₹ 1,92,000
Cost of Goods Sold = Opening Stock + Purchases – Closing Stock
1,92,000 = 20,000 + Purchases – 15,000
Purchases = ₹ 1,87,000