The sales value at splitoff method:

Cost allocation is the process of assigning costs to activities, projects, people, or other cost objects. The goal is to fairly spread costs across departments, calculate profitability, and derive transfer prices.  Joint and by-product costing are methods for allocating costs to different products that are produced from the same process or materials. They are often used in industries that deal with natural resources, such as oil, gas, mining, or agriculture.  In cost accounting, joint products are two or more products that are produced simultaneously from a common input or process.... Show more

Cost allocation is the process of assigning costs to activities, projects, people, or other cost objects. The goal is to fairly spread costs across departments, calculate profitability, and derive transfer prices. 

Joint and by-product costing are methods for allocating costs to different products that are produced from the same process or materials. They are often used in industries that deal with natural resources, such as oil, gas, mining, or agriculture. 

In cost accounting, joint products are two or more products that are produced simultaneously from a common input or process. By-products are products that have a relatively low sales value compared to the main products. 

Here are some common methods for allocating joint costs:
Sales value: Add up all production costs through the split-off point, then determine the sales value of all joint products as of the same split-off point. Assign the costs based on the sales values.
Estimated gross margins: Calculate the total processing cost for each joint product after the split-off point. Subtract this amount from the total revenue that each product will earn.
Net realizable value at the split off point or relative sales value at the end of production
The volume of production, where the realizable value of each unit of production is similar

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