please answer all required (1-4) and show all work. thank you!

Northwest Building Products (NBP) manufactures two lumber products from a joint milling process: residential building lumber (RBL) and commercial building lumber (CBL). A standard production run incurs joint costs of $460,000 and results in 80,000 units of RBL and 70,000 units of CBL Each RBL sells for $12 per unit and each CBL sells for $13 per unit. Required: 1. Assuming that no further processing occurs after the split-off point, how much of the joint costs are allocated to commercial lumber (CBL) on a physical measure method basis? 2. If no further processing occurs after the split-off point, how much of the joint cost is allocated to the residential lumber (RBL) using sales volue at split off method? 3. Assume that the CBL is not marketable at split off but must be planed and sized to cost of $310.000 per production run. During this process, 10,000 units are unavoidably lost and have no value The remaining units of CBL ore salable at $14 per unit . The RBL. although salable immediately at the split-off point is coated with a torlike preservative that costs $170,000 per production run. The RBL is then sold for $13 each. Using the net realizable value bosis, how much of the completion costs should be assigned to each unit of CBL? 4. Based on information in requirement 3, should NBP choose to process RBL beyond split-off