Currency notes - Part 1

Number Theory Level 3

At an Automated Teller Machine (ATM), notes of denominations 100, 500 and 1000 are dispensed. In order to prevent fraud, you can withdraw a maximum of 40 notes in one transaction.

What is the smallest multiple of 100 that the ATM is unable to release in one transaction?

Image credit: Wikipedia George Grinsted
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Unnikrishnan V by Unnikrishnan V
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