STAY AT HOME Co. Limited is a manufacturing company producing Nose Masks in large quantities. The following balances were extracted from its books on 30th September, 2019. Inventory 01/10/2018 GHC Raw materials 28,800 Work - in-progress 39,000 Finished goods 33,600 Sales (114,000 pieces @ GH5 each) 570,000 Carriage on raw materials 1,470 General expenses 25,200 Selling expenses 51,840 Plant and Machinery 250,280 Land 50,000 Bank overdraft 32,120 Retained earnings 816 Ordinary share capital 200,000 8% preference share capital 22,000 Goodwill 40,000 Bad debts 830 Trade receivables 36,433 Discount allowed 1,440 Sundry payables 56,636 Trade investments 8,840 Advertising 2,250 Discount received 1,920 Carriage outwards 2,280 Production wages 126,000 Office salaries 4,860 Purchase of raw materials 168,000 Returns inwards 9,000 Needles 15,000 Factory rent 13,600 Office insurance 40,800 Depreciation of plant and machinery 4,920 Inventory 30/09/2019 Raw materials 35,400 Work-in-progress 39,120 Loose tools 3,000 Additional information: i. During the year 129,000 pieces were completed. The closing inventory of finished products is valued at the cost price per nose mask produced. ii. Goods manufactured during the year are to be transferred to the trading account at GH 390,000. iii. Provide for doubtful debts at the rate of 242% of receivables. iv. Advertisement was three months prepaid. Prime cost for the business is calculated as