If main memory access time is 100ns, cache access time is 50 ns, cache hit rate is 90% then what is the average time to read from memory?

If main memory access time is 100ns, cache access time is 50 ns, cache hit rate is 90% then what is the average time to read from memory?

From the Combined Bank Senior Officer October 2021 – Preliminary exam, question 105 of 108.

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