Question: There is an old CPU running a program in which memory operations currently take 2 0 % of its execution time. Scientists find that adding

There is an old CPU running a program in which memory operations currently take 20% of its execution time. Scientists find that adding a cache memory speeds up 90% of memory operations by a factor of 4. Adding a second level of cache speeds up one fifth of the remaining 10% by a factor of 2. By how much does the overall speed increase using these optimizations?

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