Cheyney Mining Corporation operates an ore-processing plant. A typical batch of ore run through the plant yields three refined products: lead, copper, and manganese. At the split-off point, the intermediate products cannot be sold without further processing. The lead from a typical batch sells for $20,000 after incurring additional processing costs of $6,000. The copper is sold for $40,000 after additional processing costs of $5,000. The manganese yield sells for $30,000 but requires additional processing costs of

$9,000. The cost of processing the raw ore, including its purchase, is $50,000 per batch.

Required Which products should Cheyney produce and sell