. An ophthalmologist's office operates 52 weeks per year, 6 days a week. It purchases per week. The weekly demand is assumed to be a normal distribution with a standard deviation of 15 pairs. Fix ordering cost is S54 per order. Annual interest rate is 27%. Lead-time is 3 weeks. Service level requirement is 98%. The corresponding value of z can be found in the following table. (Q.R) policy is used to control the inventory. What will be the: a) Safety stock b) Reorder point d) Average inventory level Service Level 90% | 91 % | 92% | 93% | 94% | 95% | 96% | 97% | 98% | 99% | 99.9% 1.29 1.34 1.41 1.48 1.56 1.65 1.75 1.88 2.052.33 3.08