Jane Street Interview Question

How many pennies are in Manhattan

Interview Answer

Anonymous

Mar 13, 2019

I said 3-4 pennies per person, 1.5 million people. Then add a consideration for banks, forgot to add a consideration for stores and cash registers. For banks, I said 5 banks per 10 blocks, and aproximately 200 blocks, so 100 banks. With 1,000 in pennies as a minimum, we have 1E6 pennies in each bank, which is 1E8 pennies in NYC so that's 100 million plus 4.5 or 8, so just 100 million.

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