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Que. A hierarchical memory system that uses cache memory has cache access time of 50 nano seconds, main memory access time of 300 nano seconds, 75% of memory requests are for read, hit ratio of 0.8 for read access and the write-through scheme is used. What will be the average access time of the system both for read and write requests ?
a. 157.5 n.sec
b. 110 n.sec
c. 75 n.sec
d. 82.5 n.sec
Answer:157.5 n.sec
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