It depends on the degree of rounding.
To the nearest whole number, it is 420.
To the nearest thousand, it is 0.
rounded to the nearest ten... it would be 420.
420
It is the same distance from both values, but mathematically it is rounded up to 430.
The answer is 80,000
430
rounded to the nearest ten... it would be 420.
420
420
420
420
420
420
420
420
420
420
420.0