Ru Corporation produces cell phone cases and incurs the following costs per unit:

Direct Materials $=$$$6,$

Direct Labor $=$$$5,$

Variable Manufacturing Overhead $=$$$2,$

Fixed Manufacturing Overhead $=$$$1,$

Variable Administrative Expenses $=$$$3,$ and

Fixed Administrative Expenses $=$$$3.$

The total manufacturing cost per unit would be:

a$.$ $$14$

b$.$ $$13$

c$.$ $$11$

d$.$ $$16$