One item a computer store sells is supplied by a vendor who handles only that item. Demand for that item recently changed, and the store manager must determine when to replenish it$.$ The manager wants a probability of at least $96$ percent of not having a stockout during lead time. The manager expects demand to average a dozen units a day and have a standard deviation of two units a day. Leac time is variable, averaging four days with a standard deviation of one day.

Use the to get a $z$ value that represents the $0\mathrm{.}55$ service level. Then use the formula

ROP$=d^{**}LT+z(\sqrt[\phantom{2}]{(L{T}^{**}{}_d^2)+(d^2**{}_{LT}^2)})$

When should the manager reorder to achieve the desired probability? $($Round your intermediate calculations to $2$ decimal places. Round your final answer to a whole number.

ROP $=$