In calculating sales tax. Sales tax is rarely given as a whole number and is more often several decimal places long (e.g., 8.325%). Since any calculation performed with such a number is likely to have at least as many decimal places, the tax is rounded UP and added to the original total.
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shabana
use in counting
It is - if you use appropriate rounding. Rounding does not have to be to whole numbers.
if i want something new
it depends what is meant by everyday life but I round them up when I don't need an exact number and if it is easier to remember whole numbers