It really depends on the person. Both are equally common. For example, a person working at a store would probably say two thousand five hundred just to be clear. But when talking among friends a person might say twenty five hundred because it's shorter.
You can say whichever one you like best.
November 21, 2018
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In the UK, we would say either 'two and a half thousand' or 'two thousand, five hundred'. The 'twenty five hundred' approach isn't really used, except sometimes for numbers between 1100 and 1900.. Eleven hundred, twelve hundred etc..
November 21, 2018
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two and a half thousand dollars
March 10, 2020
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