Question: Memory operations currently take 3 0 % of execution time of program A . A new widget called a cache speeds up 8 0 %

Memory operations currently take 30% of execution time of program A.
A new widget called a cache speeds up 80% of memory operations by a factor of 4.
A second new widget called a L2 cache speeds up half of the remaining 20% by a factor of 2.
What is the total speed up?

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