Cache Memory Access Time

A hierarical catche memory subsystem has a catche access time of 50ns and the main storage access time is of 500ns . If 80% of memory request are for the read and th ehot ratio of 0.9, what is the average access time of the system considering only memory read cycle in the write through scheme?

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Average access time for memory read=hit ratio*cache access time+(1-hit ratio)*main memory access time
Therefore , Avg access time = 0.9 * 50ns + ( 1- 0.9 ) * 500ns = 95 ns

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