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Medium Apply Back-of-Envelope Estimation Multiple Choice

A cache stores the hot 20% of 100M objects, each 1 KB. How much RAM is needed (with 20% overhead)?

Apply — Tests ability to use knowledge in practical scenarios.

Answer Options

A 20 GB
B 24 GB
C 100 GB
D 120 GB

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This question is from the Back-of-Envelope Estimation topic (System Design).

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