Answer:
Explanation:
From the question, it seems that the existing accounting method does not take into account all or some of the extraction costs. Some batches of the raw material may be very expensive as they are procured through some expensive extraction process. So, to overcome this issue the accountant can assign all extraction costs to a joint-cost category. In this way the extraction costs of the raw material procured from some are would be shared such it will average out on the finished product.
There could be some problems with the purchase department as well and not just the accounting system. It can help the company if it can look at some expert advice in its purchasing department.