When producing $6,000$ units, the cost accountant noted the following per unit costs: variable manufacturing $$2\mathrm{.}40$ fixed manufacturing $$5\mathrm{.}20$ variable selling $$1\mathrm{.}70$ fixed selling

$$2\mathrm{.}80$

variable administrative

$$3\mathrm{.}25$

fixed administrative

$$2\mathrm{.}20$

Assuming these are the only costs, what would the total per unit product cost be at a production level of $5,000$ units $($assume this is within the relevant range$)?$

a$.$ $$7\mathrm{.}60$

b$.$ $$8\mathrm{.}64$

c$.$ $$9\mathrm{.}30$

d$.$ $$10\mathrm{.}95$

e$.$ $$12\mathrm{.}10$