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Channel shift at a passport office

The prompt

A passport office in a fictional country handles 1.2 million applications a year: 80 percent in person at a cost of USD 30 each and 20 percent online at USD 6 each. If the online share rises to 60 percent, how much does the office save each year?

Your interviewer will share data as you ask for it. Ask clarifying questions, state a hypothesis, then lay out your structure out loud before you calculate.

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