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A computer system with cache access time of 100 ns, a main memory access time of 1100 ns, and a hit ratio of 0.9. The average access time would be:
Average Memory Access Time:
$AMAT = Hit\ Time + Miss\ Rate \times Miss\ Penalty$
Hit time = 100 ns
Miss rate = $1 - 0.9 = 0.1$
Miss penalty = $1100 - 100 = 1000$
So,
$AMAT = 100 + 0.1 \times 1000$
$AMAT = 100 + 100 = 200\ ns$
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