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help in plzz

I am upto my project n having some problems in dealing with few things....what solution any of u could provide me.
Assume that we have a demand-paged memory. The page table is
held in CPU registers. It takes 8 milliseconds to service a page fault if
an empty frame is available or if the replaced page is not modified
and 20 milliseconds if the replaced page is modified. Memory access
time is 100 nanoseconds.
Assume that the page to be replaced is modified 70% of the time.
What is the maximum acceptable page-fault rate for an effective?
access time of no more than 200 nanoseconds.

thanx in advance
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