Purchases = Payment - Decrease in Creditors - Increase in Advance
= 3,70,000 - (25,000 - 17,000) - (18,000 - 11,000)
= 3,70,000 - 8,000 - 7,000 = 3,55,000.
Cost of Medicine Consumed = Opening Stock + Purchases - Closing Stock
= 62,000 + 3,55,000 - 54,000 = 3,63,000.
Note: This NPO-related question has been classified under Financial Statements / Nature-Structure as NPO accounting is not a listed subtopic.