Germantown Corporation has a joint process that produces three products: X, Y and Z. Each product may be sold at split-off or processed further and then sold. Joint-processing costs for a year amount to $100,000. Other data follows:

ProductSales Value at Split-OffSeparable Processing Costs after Split-OffSales Value at CompletionX$128,000$16,000$140,000Y50,00027,00076,000Z25,60010,00040,000

To maximize profits, the corporation should process ________ further.