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Interviewers ask this kind of question to surface how you think, not what you remember. The strongest answers are specific, calmly told, and end on what changed.

Estimation & sizing · Quick mental math

A rental house costs $380,000 and rents for $2,400 a month. Roughly, in your head: what's the gross yield, and does it cash-flow with 20% down at a 7% mortgage?

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Gross yield first: $2,400 a month is about $29,000 a year; $29,000 on $380,000 is a bit under eight percent — call it 7.…

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