What I should do with this 100 dollar bill?

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I paid 75€ for this 100 dollar bill to my coworker, when some one paid him a taxi ride in Finland. So should I try exchange to euro in some forex trader or just keep this dollar bill for later use? What is your opinion which is better 100 USD or 100 SBD?

What I should do with this 100 dollar bill? | Ecency