An electronics superstore is carrying a 60 LEDTV for the upcoming Christmas holiday sales. The optimal service level is 80%. The period of sales is normally distributed with an average 8 weeks, and standard deviation of 1.6 weeks. Demand per week is fixed and is 25 units. One of the following formulas may be useful. Sigma(LTD) = SQRT(L)*Sigma(R). Sigma(LTD) = R*Sigma(L).

3. How many units should we order to retain the optimal service level (roundup)?

The potential answers are:

A: 100

B: 103

C: 234

D: 279

E: 110