please help me understand these 4 problems with the work and answers provided !

3. Bolton Electric purchases 220 boxes of light bulbs a year. The boxes cost $6 each. It costs $14 to order each box of light bulbs, and carrying costs are $7 per box on an annual basis. Determine the annual cost of ordering and carrying the boxes of light bulbs. A. 208 , B. 9 , C. 214 4. The monthly demand for shampoo bottles is 150 units, each costing $15. It has been determined that annual holding cost is equal to 20% of purchase cost and order cost is $15. The economic order quantity is: A. 39 , B. 150 C. 134 5. In the basic EOQ model, if annual demand is 2000 per year, the set up costs are $80, and holding cost is $10 per unit per month, what is the economic order quantity? A. 25 , B. 126 , C. 52 6. Kona's Manufacturing purchases 7000 boxes of organic dog treats per year. Boxes of the treats are priced as follows: 1 to 999:$1.30 dollars each, 1,0001,499:$0.80 cents each, and 1,500 or more: $0.65 cents each. It costs $25 to prepare an order and receive it and carrying costs are 25 percent of unit cost per unit on an annual basis. Determine the feasible order quantity (you do not need to determine the total cost for this problem). A. 1038 , B. 1468 , C. 1323