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Consider a paging system with a page table stored in memory where memory reference takes 200 nanoseconds and all pages are in memory. What is the effective memory reference time if the hit ratio for the associative registers is 70%, the hitratio for memory is 20%, and 10% of the time we must go out to the disk to load the faulted page inmemory, where context switching, disk transfer time, etc takes 100 nanoseconds.). TLB access time is 10ns.

The given answer is 299ns but i am getting 290ns.
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