given the following information, determine the amount to order using the fixed

$-$

interval model, d

$=$

$4$

$2$

$$units per day desired service level

$=$

$0$

$.$

$9$

$9$

$$percent

$0$

d

$=$

$4$

$$units per day amount on hand at reorder time

$=$

$7$

$7$

$$units

LT $=3$ days Ol $=7$ days