It depends on the magnitude to which it is rounded.
To the nearest integer (or smaller) it is 9 999 999
To the nearest 10, 100, etc to 10 million, it is 10 000 000 000
To the nearest 100 million or larger, it is 0
It is 999, exactly as in the question.
100
899.110% off of 999= 10% discount applied to 999= 999 - (10% * 999)= 999 - (0.10 * 999)= 999 - 99.9= 899.1
1,000
It is: 1,000
It is 999, exactly as in the question.
100
1000
899.110% off of 999= 10% discount applied to 999= 999 - (10% * 999)= 999 - (0.10 * 999)= 999 - 99.9= 899.1
1,000
It is: 1,000
15 percent off 999 dollars: $999 x 0.15 = $149.85
180
1, 3, 9
9,18,27,36,45,54,63,72,81,90
1, 3 and 9
To the nearest thousand, 57000