A company absorbs factory overheads at a rate of N$25 per direct labour hour. During 2021 all finished goods were sold and under/over-absorbed overheads were transferred to cost of goods sold. There were no opening and closing balances of work in process. Additional information is as follows: N$ Building materials (bricks, cements, zincs, etc.) 100 000 Indirect labour cost 50 000 Wages of builders, electricians and plumbers 200 000 Indirect material used 20 000 Depreciation of office equipment 100 000 Sundry factory overheads 50 000 Calculate the amount of total manufacturing costs for the period