It is 12.1
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4.99845805 follows the normal rules of rounding. If it is rounded to 1 decimal place, it becomes 5.0.
20.1
7.1 Do not make the mistake of rounding to 7.15 and then 7.2
When rounding 34.789 to 1 decimal place, you look at the digit in the tenths place, which is the 8. Since 8 is greater than or equal to 5, you round up the digit in the ones place, which is the 9. Therefore, 34.789 rounded to 1 decimal place is 34.8.
57.9