DO b AND d pls.

Joe Birra needs to purchase malt for his microbrewery production. His supplier charges $35 per delivery (no matter how much is delivered) and $1.20 per gallon. Joe's annual holding cost per unit is 35 percent of the price per gallon. Joe uses 250 gallons of malt per week. a. b. C. d. Suppose Joe orders 1,000 gallons each time. What is his average inventory (in gal)? (Round your answer to 2 decimal places.) Suppose Joe orders 1,500 gallons each time. How many orders does he place with his supplier each year? How many gallons should Joe order from his supplier with each order to minimize the sum of the ordering and holding costs? (Round your answer to 3 decimal places.) Suppose Joe orders 2,500 gallons each time he places an order with the supplier. What is the sum of the ordering and holding costs per gallon? 500 gallons 9.00 orders 1,472 gallons $707.000 per gallon