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Q3. Consider a system with memory mapping done on a page basis and using a single level page table. Assume that that necessary page table is always in memory. a. If a memory reference takes 200 ns, how long a paged memory reference takes? b. If there are 2 level page tables, what is the time now? C. Now we add, MMU that imposes an overhead of 20ns on a hit or a miss. If we have 85% hit ratio, what would be EAT