Guster Chemical Company (GCC) manufactures two products as part of a joint process: X1 and Y1. Joint costs up to the split-off point total $20,000. The joint costs are allocated to X1 and Y1 in proportion to their relative sales values. At the split-off point, product X1 can be sold for $30,300, whereas product Y1 can be sold for $70,700. Product X1 can be processed further to make product X2, ot an incremental cost of $36,000. X2 can be sold for $83,000. Product Y1 can be processed further to make product Y2, at an incremental cost of $46,000. Y 2 can be sold for $93,000. The net change in operating income resulting from a decision to manufacture product Y2 is