Question $38$ options:

Consider a demand paging system where $90\%$ of the page table is stored in the registers, and the rest needs to be addressed from the memory. Assume any reference to the memory takes $0\mathrm{.}5$ us$,$ and $40\%$ of the time the page that is being replaced has its dirty bit set to $1.$ Swapping a page in takes $1000$ us$.$ Assume swapping a page out takes $2000$ us$.$

How long does a memory reference take, if the address is paged in physical memory $($in microseconds$)?$ Round the answer to only $2$ decimal places

$0\mathrm{.}55$

What is the Effective Access Time $($EAT$)$ if the page fault ratio is $0\mathrm{.}01($in microseconds$)?$ Round the answer to only $2$ decimal places

$30\mathrm{.}50$

What should be the maximum acceptable page fault ratio if we only want $20\%$ performance degradation? Round the answer to only FIVE decimal places