please answer A-D asap, this is one whole question. ty

Tom is a habitual shopper at garage sales. Last Saturday he stopped at one where there were several types of used building materials for sale. At the low prices being askedTom knew that he could resell the items in another town for a substantial gain, Four things stood in his way: he could only make one round trip to resell the goods, his pickup truck bed would hold only 1000 pounds; the pickup truck bed could hold at most 70 cubic feet of merchandise, and he had only $200 cash with him. He wants you to help him load his truck with the optimal mix of materials. Item Cubic feet per unit Weight per Resale profit Price per unit unit per unit 2 x 4 studs 1 $0.10 5 pounds $0.80 4 x 8 plywood 3 $0.50 20 pounds $3.00 Concrete blocks 0.5 $0.25 10 pounds $0.75 Formulate this problem as a linear program to find the optimal mix of items to maximize Tom's resale proft a. How much should Tom haul of each item? Select b. What is his resale profit? [Select] c. What is the minimum amount of re-sale profit that studs need to increase by for Tom to consider this item in the product mix? Select] d. How much would profits decrease, if Tom decided to only load 60 cubic feet? Select