Answer:
prepare Trial Balance as at 31st December, 2012: Machinery 3,00,000; Purchases 7,22,100; Opening Stock 4,80,000; Land and Building 3,60,000; Trade Expenses 20,000; Bills Payable 30,000; Cash at Bank 31,500; Commission 1,40,000; Salary 45,000, Purchases Return 15,000; Discount 2,100; Sales 11,40,000; Debtors 2,40,000; Bills Receivable 1,20,000; Carriage Inwards *4,500; Carriage Outwards 7,200