Given the following information:

Expected demand during a lead time $=670$ kg

Standard deviation of demand during a lead time $=68$ kg

Demand during a lead time is distributed Normally Acceptable stockout risk during a lead time $=6$ percent

Refer: z$-$values table.

a$.$ What amount of safety stock is appropriate? $($Round the final answer to the nearest whole number.$)$

Safety stock

kg

b$.$ At what level of inventory should this item be reordered?

ROP

kg