I had this a few years back lol the awnser is 1
When you round to the nearest tenth, you just look at the tenths place. In this case it's the 8. If the next number is below 5 then it stays the same. If it's above you add one. So your number would be 5,280. If the original number was 5,286 then the answer would be 5,290. Anyway the final answer is 5,280.
Refuse to answer , finish the interview and then report it to the next up boss