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Suppose it takes $100$ $ns$ to access page table and $20$ $ns$ to access associative memory. If the average access time is $28$ $ns$, the corresponding hit rate is:

  1. $100$ percent                       
  2. $90$ percent   
  3. $80$ percent             
  4. $70$ percent
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page table access time=100 ns

memory access time=20 ns 

average access time= 28 ns,

let hit rate be h

avg memory access time= h X memory access time + (1-h) X page                                                 table access time

                                         28=h X 20 + (1-h)100

                                          h=90%

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