please help asap

Joe Birra needs to purchase malt for his microbrewery production. His supplier charges $25 per delivery (no matter how much is delivered) and $1.25 per gallon, Joe's annual holding cost per unit is 25 percent of the price per gallon. Joe uses 520 gallons of malt per week. Assuming there are 52 weeks per year. How many gallons should Joe order from his supplier with each order to minimize the sum of the ordering and holding costs? (round up to the nearest integer) Millennium Liquors is a wholesaler of sparkling wines. Its most popular product is the French Bete Noire, which is shipped directly from France. Weekly demand is 50 cases. Assume Millennium Liquors operates 52 weeks in a year. Millennium purchases each case for $100, there is a $260 fixed cost for each order (independent of the quantity ordered), and its annual holding cost is 20 percent. If Millennium is restricted to ordering in multiples of 50 cases (e.g., 50,100,150, etc.), how many cases should it order to minimize its annual ordering and holding costs? (round up to the nearest integer) Teddy Bower is an outdoor clothing and accessories chain that purchases a line of parkas at $10 each from its Asian supplier, TeddySports. Unfortunately, at the time of the order placement, demand is still uncertain: Teddy Bower forecasts that its demand is normally distributed with a mean of 1800 and a standard deviation of 1000. Teddy Bower sells these parkas at $22 each. Unsold parkas have little salvage value: Teddy Bower simply gives them away to a charity (and also doesn't collect a tax benefit for the donation). How many parkas should Teddy Bower buy from TeddySports to maximize expected profit? (please use the normal distribution table and round up to the nearest integer)