If the total average unit price of materials can be calculated by the cost management system, the material cost incurred in the current month, the manufacturing cost in the current month, and the cost of sales in the current month can be calculated by accumulating processing costs for each process using the cumulative method, which is necessary for creating P/L.
The manufacturing cost calculated by "inventory of work in progress at the beginning of the month + expenses incurred during the month - inventory of work in progress at the end of the month" can also be calculated by "total average unit price of input products x quantity of input products + own process processing cost", and the breakdown by cost item for each process becomes a cumulative method.