Dunstreet's Department Store would like to develop an inventory ordering policy with a $95$ percenfingrobability of not stocking out. To illustrate your recommended procedure, use as an example the ordering policy for white percale sheets.

Demand for white percale sheets is $4,000$ per year. The store is open $365$ days per year. Every two weeks $(14$ days$)$ inventory is counted and a new order is placed. It takes $10$ days for the sheets to be delivered. Standard deviation of demand for the sheets is four per day. There are currently $150$ sheets on$-$hand.

How many sheets should you order?

Note: Use Excel's NORMSINV$()$ function to find the correct critical value for the given $a-$level. Do not round intermediate calculations. Round $"z"$ value to $2$ decimal places and final answer to the nearest whole number.

Number of sheets