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A CPU's cache has a hit ratio of 0.9 and an access time of 10 ns. On a cache miss, the CPU must also access main memory, so the total time on a miss is 10 ns + 100 ns = 110 ns. What is the average memory access time?
- A19 ns
- B20 ns
- C21 ns
- D22 ns
Correct answer: B