No. 12.5 is nearer. But 12.5 is not the nearest because 12.05 is nearer. But again, 12.05 is not the nearest because 12.005 is nearer. Rational (and real) numbers are infinitely dense. That means that there are infinitely many numbers between any two numbers and so NO number is nearest to any other: it is always possible to find infinitely many numbers that are nearer.
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If rounding to the nearest whole number, it is closer to 13 than to 12.
Your question is somewhat unclear. If the 12 represents dollars, it is 80 cents; if the 12 represents cents, it is 13.
To the nearest whole number it founds off to 12
12 to the nearest tens place = 10
13