85 since the most appropriate rounding for 90 is by the tens.
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True, but only if you are rounding to the nearest 10s - and there is no justification for assuming that. It could equally be to the nearest integer.
Or, you could be rounding to the nearest 30 (eg approx days in months), in which case you would go for 75. Less than 75 is 2 months = 60 days, more than is 3 months = 90 days.
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89.456 should be rounded to 89 (to the nearest whole number) but it should be rounded UP to 90.
Since 90 is a whole number, rounding 85 to 90 does result in a whole number.
The smallest whole number that can be rounded to 500 is 450.
85,500 is the lowest number that can be rounded to 86,000. 85,499 would round down to 85,000
The least number that can be rounded off to 80 to the nearest integer is 75.