$($a$)$ What is the optimal order quantity for MBC$?$

$($b$)$ How frequently should MBC order to replenish the gasoline supply?

$($c$)$ The MBC storage tanks have a capacity of $17,500$ gallons. Should MBC consider expanding the capacity of its storage tanks?

The maximum inventory is $,].$ MBC does not need $$ to expand its storage tanks.

$($d$)$ What is the reorder point $($in gallons$)?$

gallons