(20) A production line has lead time of 2 weeks. Lots are released every 3 weeks. The demand forecast error is N(0,5) per week. Inventory carrying cost is $3 per week. If not enough product is produced in a cycle, the lost sale cost is $12 per unit. What production safety stock should be used, and what is the additional cost per cycle? (20) A production line has lead time of 2 weeks. Lots are released every 3 weeks. The demand forecast error is N(0,5) per week. Inventory carrying cost is $3 per week. If not enough product is produced in a cycle, the lost sale cost is $12 per unit. What production safety stock should be used, and what is the additional cost per cycle