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just came across the same question you need to add an extra 500 to your calculation for accessing the main memory because it actually has to be accessed twice: once for making the page table and another for the actual data, when using virtual memory (0.95x20) + 0.05 (0.01(10000+500+500+20) + 0.99(500+500+20)) =75 which i would have guessed is closeset to D

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