6.9 is a mixed fraction in decimal form and there is no sensible way to represent it as a whole number.
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50000 is a whole number
93000000 is, itself a whole number so you would write it exactly as in the question.
80,000Since it is a whole number, there's not really a way to write it as anything else.
15,000 is already a whole number. A whole number is any number that is not a fraction or decimal. 15,00.96 would not be a whole number, but a decimal.
When rounding, if the number is greater than or equal to half, you round up. So 68.50 rounded to the nearest whole number is 69.