Barrett Chemicals manufactures four chemicals, Chem$-1,$ Chem$-2,$ Chem$-3,$ and Chem$-4,$ from a joint process. The total joint costs in May were $$564,000.$ Additional information follows:

$\backslash$table$[[,,,$If Processed Further$],[,$Units,Sales Value at$,$Additional,$],[$Product$,$Produced,Split$-0$ff$,$Costs,Sales Values$],[$Chem$-1,297,000,$$$229,000,$$$33,600,$$$269,000$