Please help me with these questions. Provide a source if you have any, thanks!

Identification:

__________1. Additional costs incurred between split-off point and sale.

__________2. Proration of joint cost on the basis of relative sales values of joint products at split-off.

__________3. Calculation employed by all commonly used allocation methods.

__________4. Uses a common physical characteristic of the joint products as the proration base.