Order Quantity: $Q=R-1,$ where

$R=$ restocking order$-$up$-$to level

$I=$ inventory level at the time of review

Minimum Restocking Level $=d(RP)+d(L)$

$RP=$ reorder period: time between orders

$L=$ replenishment lead time $($time periods$)$

$d=$ average demand per time period