a. PT NTC starts every week with a stock of 250 products. This stock will run out every week and will be reordered. If carrying costs per product are $75 per year and fixed ordering costs are $200 : - What is the total transportation cost? (2%) - How much is the re-storage fee? (2%) - Should PT NTC increase or decrease the size of its order? (2\%) - Explain the optimal inventory policy for PT NTC in terms of order size and order frequency! (2%) b. PT NTC also has a new policy for the company. The following is company information reqarding old and new policies: Calculate the NPV of the policy change withreturn rate 1.5%. (7%)