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Solution to point c)

Present Case

Considering that P1=95%  (the probability to go in stock out in one cycle) and that Qi and D are known it is straighforward:

 

Component Type number of Stock Out/year
1 6
2 4.24
3 5.37

 

Considering that for each  type there are 27 different component the ETSOPY=421.45

 Future Case

Similarly ETSOPY= 140.48 (1/3 respect Present Case).