In the case of process type of industries it is possible to determine the average cost per unit
by dividing the total cost incurred during a given period of time by the total number of unitsproduced during the same period. But this is hardly the case in most of the process type
industries where manufacturing is a continuous activity. The reason is that the cost incurred in
such industries represents the cost of work carried on opening work-in-progress, closing workin-
progress and completed units. Thus to ascertain the cost of each completed unit it is
necessary to ascertain the cost of work-in-progress in the beginning and at the end of the
process.
The valuation of work-in-progress presents a good deal of difficulty because it has units under
different stages of completion from those in which work has just begun to those which are only
a step short of completion. Work-in-progress can be valued on actual basis, i.e., materials
used on the unfinished units and the actual amount of labour expenses involved. However, the
degree of accuracy in such a case cannot be satisfactory. An alternative method is based on
converting partly finished units into equivalent finished units.
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