General Chemical Company (GCC) manufactures two products as part of a joint process: A1 and B1. Joint costs up to the split-off point total $21,000. The joint costs are allocated to A1 and B1 in proportion to their relative sales values. At the split-off point, product A1 can be sold for $41,200, whereas product B1 can be sold for $61,800. Product A1 can be processed further to make product A2, at an incremental cost of $37,000. A2 can be sold for $84,000. Product B1 can be processed further to make product B2, at an incremental cost of $47,000. B2 can be sold for $94,000. Joint costs allocated to product B1 total: Multiple Choice $12,600. $8,400. $21000