Michigan Farm Bureau, Lansing, added the Principal LifeTime funds as an investment option in its $13 million 401(k) plan, said Michael Longstreet, benefits and compensation manager. The 401(k) committee decided in March to help participants determine appropriate asset allocations, Mr. Longstreet said. Participants may also follow a Principal risk-assessment profile to design their asset allocations, he said. The plan offers 19 options. Principal is bundled provider.