The local supermarket buys lettuce each day

1) The local supermarket buys lettuce each day to ensure really fresh produce. Each morning any
lettuce that is left from the previous day is sold to a dealer that resells it to farmers who use it to
feed their animals. This week the supermarket can buy fresh lettuce for $4.00 a box. The lettuce is
sold for $10.00 a box and the dealer that sells old lettuce is willing to pay $1.50 a box. Past
history says that tomorrow's demand for lettuce averages 250 boxes with a standard deviation of
30 boxes. How many boxes of lettuce should the supermarket purchase tomorrow?

2) Jill's Job shop buys two parts (Tegdiws and Widgets) for use in its production system from two
different suppliers. The parts are needed throughout the entire 52-week year. Tegdiws are used at
a relatively constant rate and are ordered whenever the remaining quantity drops to the reorder
level. Widgets are ordered from a supplier who stops by every three weeks. Data for both
products are as follows:

a) What is the inventory control system for Tegdiws? (reorder quantity and reorder point)
Tegdiws – Fixed Order Quantity Model
b) What is the inventory control system for Widgets?

3) Dunstreet's department store would like to develop an inventory ordering policy of a 95%
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 5000 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 five per day. There are
currently 130 sheets on hand. How many sheets should you order?