What is the average access time of a system

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What is the average access time of a system having three levels of memory-a cache memory, a semiconductor main memory and magnetic disk secondary memory - if the access times of the memories are 20 ns, 200 ns and 2 ms, respectively? The cache hit ratio is 80 per cent and the main memory hit ratio is 99 per cent.

Reference no: EM131339541

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