Calculate theSafety Stockof the following data:

Period Value

Current Period P 420

Last Period P-1 440

P-2 500

P-3 520

P-4 500

P-5 480

P-6 489

P-7 441

P-8 409

P-9 400

P-10 360

P-11 330

P-12 420

P-13 439

P-14 520

P-15 550

P-16 600

P-17 700

P-18 650

P-19 600

P-20 549

P-21 500

P-22 450

P-23 432

The processing time is 1 days, planned delivery time is 4 days, service level is 99%, the forecast periods is 12 months, alpha is 0.1, beta is 0.3, gamma is 0.2.

Given the Safety Stock = R x Sq.rt W x MAD where R is the relationship between forecast accuracy and service level, W is the delivery time (in days) / forecast period (in days) , MAD is the mean absolute deviation.