Please help with B & E

PA 11-6 (Algo) Anvil's Works requires on average... Anvils Works' requires, on average, 2,500 tons of aluminum each week, with a standard deviation of 700 tons. The lead time to receive Its orders is 12 weeks. The holding cost for one ton of aluminum for one week is $9. It operates with a 0.98 In-stock probability. Use Table 11.5. (Round your answer to nearest integer.) a. On average, how many tons does it have on order? 30,000 tons (Round your answer to nearest integer.) b. On average, how many tons does it have on hand? tons (Round your answer to nearest integer.) c. If its average inventory was 6,500 tons, what would be its average holding cost per week? S 58,500 per week (Round your answer to 2 decimal places.) d. If its average inventory was 13,000 tons, what would be its average holding cost per ton of aluminum? S 46.80 per ton (Round your answer to 4 decimal places.) Suppose its on-hand inventory is 5,400 tons, on average. What in-stock probability does it offer to its customers? e. TABLE 11.5 In-Stock Probabilities and Matching Safety Factors, z In-Stock Probability Safety Factor, z Safety Factor, z In-Stock Probability 0.9000 1.28 1.25 0.8944 0.9800 2.05 2.00 0.9773 0.9900 2.33 2.25 0.9878 0.9950 2.58 2.50 0.9938 0.9999 3.72 3.00 0.9987