$1)$ Ann Chovies, owner of the Perfect Pasta Pizza Parlour, uses $20$ pounds of pepperoni each day in preparing pizzas. Order costs for pepperoni are $$10\mathrm{.}00$ per order, and holding costs are $4$ cents per pound per day. Lead time for each order is $3$ days, and the pepperoni itself costs $$3\mathrm{.}00$ per pound.

If she were to order $80$ pounds of pepperoni at a time, what would be the average inventory level?

a$)20$ pounds

b$)40$ pounds

c$)25$ pounds

d$)45$ pounds