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The default memory organization if nothing is specified- simultaneous access mem. org.

Therefore, in write-through we would use simultaneous access memory organization.

Note- In write-back, since the simultaneous access mem. org. doesn't support, therefore use the strict hierarchical access mem. org.

Therefore, Answer to the question-

tavg = 0.85*(0.92*10 + 0.08*100) + 0.15*100 = 29.62 ns.

 

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