- 15 Marks
Compute relevant cost of producing a motor, considering materials, labour, machine costs, and overheads, with reasons for cost inclusion/exclusion.
Question
Apex Manufacturing Limited (AML) is engaged in the manufacture of specialised motors. The company has been asked to provide a quotation for building a motor for a large textile industrial unit in Kumasi. Following information has been obtained by AML’s technical manager in a one-hour meeting with the potential customer. The manager is paid an annual salary equivalent to GH¢2,500 per eight-hour day.
(i) The motor would require 120 ft. of Wire-C which is regularly used by AML in production. AML has 300 ft. of Wire-C in inventory at the cost of GH¢65 per ft. The resale value of Wire-C is GH¢63 and its current replacement cost is GH¢68 per ft.
(ii) 50 kg of another material viz. Wire-D and 30 other small components would also be required by AML for the motor. Wire-D would be purchased from a supplier at GH¢10 per kg. The supplier sells a minimum quantity of 60 kg per order. However, the remaining quantity of Wire-D will be of no use to AML after the completion of the contract. The other small components will be purchased from the market at GH¢80 per component.
(iii) The manufacturing process would require 250 hours of skilled labour and 30 machine hours.
The skilled workers are paid a guaranteed wage of GH¢20 per hour and the current spare capacity available with AML for such class of workers is 100 direct labour hours. However, additional labour hours may be obtained by either:
- Paying overtime at GH¢23 per hour; or
- Hiring temporary workers at GH¢21 per hour. These workers would require 5 hours of supervision by AML’s existing supervisor who would be paid overtime of GH¢20 per hour.
The machine on which the motor would be manufactured was leased by AML last year at a monthly rent of GH¢5,000 and it has a spare capacity of 110 hours per month. The variable running cost of the machine is GH¢15 per hour.
(iv) Fixed overheads are absorbed at the rate of GH¢25 per direct labour hour.
Required:
Compute the relevant cost of producing the textile motor. Give brief reasons for the inclusion or exclusion of any cost from your computation.
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