99.9 CI means that there is a 99.9% chance the CI limits contains the value you are looking for.
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15 percent off 999 dollars: $999 x 0.15 = $149.85
899.110% off of 999= 10% discount applied to 999= 999 - (10% * 999)= 999 - (0.10 * 999)= 999 - 99.9= 899.1
$999
999/500
No. 999 is not the same as 99.9% since 99.9% is equal to 0.999.