Problem 8.8 The following details are extracted from the costing records of an oil refinery for the week ended 30 September 2010. Purchase of 500 tonnes of copra $2,00,000. Crushing plant Refinery plant Cost of labour 2,500 1,000 Electric power 600 360 Sundry material 100 2,000 Finishing 1500 240 280 330 140 Repairs to machinery a 600 450 450 Steam 1,320 660 220 Factory expenses 7500 Cost of casks 300 tonnes of crude oil was produced. 250 tonnes of oil was produced by refining process. 248 tonnes of refined oil was finished for delivery. Copra sack sold 400. 175 tonnes of copra residue sold 11,000. Loss in weight in crushing 25 tonnes. 45 tonnes by-product was obtained from refining process valued at 26,750. You are quired to show the accounts in respect of each of the following stages of manufacture for the purpose of arriving at the cost per tonne of each process and also the total cost per une of finished oil. (a) Copra crushing process, (b) Refining process, (c) Finishing process