Required information Problem 17-30 Joint Costs (LO 17-4, 17-5) (The following information applies to the questions displayed below) Allegheny River Sawmill manufactures two lumber products from a joint milling process. The two products developed are mine support braces (MSB) and unseasoned commercial building lumber (CBL). A standard production run incurs joint costs of $780,000 and results in 63,000 units of MSB and 93.000 units of CBL Each MSB sells for $8, and each unit of CBL sells for $13. Problem 17-30 Part 1 Required: 1. Calculate the amount of joint cost allocated to commercial building lumber (CBL) on a physical-units basis. (Round the calculation of relative proportions to four decimal places.) Joint cost allocated to CBL