If next year's production decreases to $23,000$ units and general cost behavior patterns do not change, what is the likely effect on

a$.$ The direct$-$labor cost of $$37$ per unit?

No change

Increase

Decrease

b$.$ The fixed manufacturing overhead cost of $$600,000?$

No change

Increase

Decrease

c$.$ The fixed selling and administrative cost of $$860,000?$

No change

Increase

Decrease

d$.$ The average unit cost of production?

No change