Question: 4 . 7 A computer has a cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache,

4.7 A computer has a cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 9ns are required to access it. If it is in main memory but not in the cache, 80ns are needed to load it into the cache, and then the reference is started again. If the word is not in main memory, 8ms are required to fetch the word from disk, followed by 80ns to copy it to the cache, and then the reference is started again. The cache miss rate is 9% and the main memory miss rate is 30%. What is the average time in nanoseconds required to access a referenced word on this system?
4.7 A computer has a cache, main memory, and a disk

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