Joe Birra needs to purchase malt for his microbrewery production. His supplier charges $$40$ per delivery $($no matter how much is delivered$)$ and $$1\mathrm{.}25$ per gallon. Joe$$s annual holding cost per unit is $25$ percent of the price per gallon. Joe uses $300$ gallons of malt per week. How many gallons should Joe order from his supplier with each order to minimize the sum of the ordering and holding costs?