31000 rounded to the nearest ten thousand

The 3 is in the ten thousands place so the number to the right of that tells you if you need to tound up or down. Anynumber 5 or higher then you round up. If lower than five you leave it alone.
So answer is slready rounded -

Yes you do, so £1973.09 - £1473.50 = £499.59 so tim overpaid £499.59 .hope this ; )