Phillippe manufactures A and B from a joint process (cost = $80,000). Ten thousand pounds of B can be sold at split-off for $15 per pound or processed further at an additional cost of $20,000 and later sold for $18. If Phillippe decides to process B beyond the split-off point, operating income will: Select one: a. decrease by $58,000. b. decrease by $20,000. o c.increase by $10,000. . d. decrease by $10,000. e. increase by $20,000