A computer has a cache , main memory and a disk used for virtual memory. For a referenced word (which is in the cache) 10 ns are required to access. An access to main memory (if it is in the main memory)  50ns are required to access it. If the word is in disk the access takes 500ns. The cache hit ratio is 0.9 and the main memory hit ratio is 0.7. What is the average time in ns to access a referenced word on this system?

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