A store has collected the following information on one of its products:

Demand $=4,500$ units$/$year

Standard deviation of weekly demand $=12$ units

Ordering costs $=$$$\frac{40}{?}$ order

Holding costs $=$$$\frac{3}{?}$ unit$/$year

Cycle$-$service level for $90\%=1\mathrm{.}28$

Lead$-$time $=2$ weeks

Number of weeks per year $=52$ weeks

EOQ$=346$

Given this data, if the store uses a P system for inventory control, how often will it review the inventory position for this product?

SHOW WORK $($steps which correspond with your answer$)$