Please provide an explanation or cite sources of info.

Shenk Company needs 20,000 components for a product it manufactures. If Shenk buys the component from Vistavia Company instead of making it, Shenk could rent the released facilities as storage to another company for $70,000. Sixty percent of the fixed overhead applied will continue to be incurred regardless of what decision is made. The following information is available: Cost to Shenk to make the part: Direct materials -- $5 Direct labor -- $16 Variable overhead -- $8 Fixed overhead -- $10 Cost to buy the part from Vistavia Company: $44 Which alternative is more desirable for Shenk and by what amount