Dunstreet's Department Store would like to develop an inventory ordering

policy with a $90$ percent probability 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 $4,300$ per year. The store is open $365$ days

per year. Every four weeks $(28$ days$)$ inventory is counted and a new order is

placed. It takes $9$ days for the sheets to be delivered. Standard deviation of

demand for the sheets is five per day. There are currently $100$ sheets on$-$hand.

How many sheets should you order?

Note: Use Excel's NORM.S$.$INV$()$ function to find the $z$ value. Do not round

intermediate calculations. Round $z$ value to $2$ decimal places and final

answer to the nearest whole number.

Number of sheets