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Consider a paging system that uses $1$-level page table residing in main memory and a TLB for address translation. Each main memory access takes $100$ ns and TLB lookup takes $20$ ns. Each page transfer to/from the disk takes $5000$ ns. Assume that the TLB hit ratio is $95 \%$, page fault rate is $10 \%$. Assume that for $20 \%$ of the total page faults, a dirty page has to be written back to disk before the required page is read from disk. TLB update time is negligible. The average memory access time in ns (round off to $1$ decimal places) is ___________
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