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Try to think it through like you’re actually executing the trade. “I am selling dollars for Pounds” Every time you calculate it use the number that results in less. So if you’re buying Pounds, it costs 1.701 dollars. If you’re selling Pounds for Euros, you get the lower one - 1.2 euros. Just remember, the bid-ask spread screws you, so always choose the number that will result in making you the least money.

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