Annual demand, D = 1000 units
a)
Recommended order quantity = sqrt(2DCo/Ch)
= sqrt(2*1000*25.5/8)
= 80 units
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b)
for 2% probability of stockout, z value = NORMSINV(1-2%) = 2.05
Safety stock = z = 2.05*5 = 10 units (rounded off)
Reorder point = +safety stock
= 25+10
= 35 units
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c)
For given reorder point (R) of 30, z value = (R-)/
= (30-25)/5
= 1
P(z) = NORMSDIST(1) = 0.84
Probability of stockout = 1-0.84
= 16 %
Number of order cycles per year = D/Q
= 1000/80
= 12.5
Number of times stockout = 12.5*16%
= 2 times
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