In a two-level memory hierarchy, the access time of the memory is 12 nanoseconds, and the access time of the main memory is 1.5 microseconds. The…

In a two-level memory hierarchy, the access time of the memory is 12 nanoseconds, and the access time of the main memory is 1.5 microseconds. The hit ratio is 0.98. What is the average access time of the two-level memory system?

1. a) 13.5 nsec
2. b) 42 nsec
3. c) 7.56 nsec
4. d) 76 nsec