DVD-Rs at a retailer is normally distributed Weekly demand for with a mean of 1,000 boxes and a standard deMation of 150 Currently the store places orders to the supplier, with a reorder point of 4,200 boxes The order quantity to the supplier is f ed at 5,0 bo es Replenishment lead time ls 4 weeks, fixed order cost per order s $10 each box costs the retailer St and the inventory nolding costis 2 % per ea· Given the rcorder point valuc of 4,200 boxos, calculate the safety stock currently in place at the retailer?