Demand for a type of computer at Best Buy is $800$ units per year. Best Buy incurs a fixed order placement, transportation, and receiving cost of $$3,500$ each time an order is placed. Each computer costs Best Buy $$1,850$ and the retailer has an annual holding cost of $25$ percent. Evaluate the optimal number of computers that the store manager should order in each replenishment lot.

a$.$

$90$ units

b$.$

$110$ units

c$.$

$150$ units

d$.$

$190$ units