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Suppose we have a 3 level memory hierarchy with following specs,

level1 - 4 words per block, 4 blocks, the access time of 10ns/word.

level2 - 16 words per block, 8 blocks, the access time of 20 ns/word.

level3 - 32 words per block, 16 blocks, the access time of 400ns/word.

when there is a miss in l1, it goes to l2 and when miss in l2 , it goes to l3, then a word will be read from level1. What is average access time for the above transfer?

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