Walman corp. manufactures products x, y, and z from a joint production process. joint costs are allocated to products on the basis of relative sales value at the split-off point. additional information is as follows: x y z total units produced 14,000 10,000 6,000 30,000 joint costs $204,000 $90,000 $66,000 $360,000 sales value at split-off ? 150,000 110,000 600,000 additional costs for further processing 38,000 30,000 22,000 90,000 sales value if processed further 348,000 185,000 147,000 680,000 based solely on a relevant cost analysis, which of the three products should be manufactured by walman beyond the split-off point?