Alice is planning to open up a sandwich shop. An estimate of her costs$/$revenues are as follows:

average listed sales price per sandwich: $$14\mathrm{.}75$

yearly rent: $$36000$

monthly fixed utility bill: $$800$

average cost of ingredients per sandwich: $$6\mathrm{.}55$

monthly labour bill $($fixed$)$: $$10500$

miscellaneous fixed supplies$/$month: $$1000$

misc. variable supplies per sandwich : $$1\mathrm{.}55$

average promotional discount per sandwich: $$0\mathrm{.}10$

How many sandwiches does she need to sell per month to break even on an advertising campaign estimated to cost $$2100$ per month?

Question $4$ options:

$321$ units

$316$ units

$379$ units

$352$ units