The answer depends entirely upon the level of precision of the rounding, which the question does not specify.
Round to the nearest 1000 and the answer is 500.
Round to the nearest 1 and the answer is 999.5.
Round to any other level of accuracy and you get a different answer again.
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3500
850
If the decimal is .5 or greater you round up. Such as if a number is 7.5 you round it off to 8.
250.0...1, if rounding to the nearest hundred.250 should be rounded down to 200 although some would round it up.
28000 (twenty-eight thousand).