Answer: $13, don't just copy that answer actually try to understand it. ⬇️
Step-by-step explanation: Think of it as a number line.
$12-$12.10-$12.20-$12.30-$12.40-$12.50-$12.60-$12.70-$12.80-$12.90$13
the $12.50 is directly in the middle of $12 and $13. Lets say it $12.51 now its not directly in the middle, but more over to the $13, so then we would go up to 13$ which is the nearest dollar. If it were $12.49 then it would be closer to the $12, so we would go down to $12.
I hope this helps!