It means that your blood contains 0.29% alcohol by volume. This is a high enough level to render people unconscious who are not used to drinking, and is even potentially fatal for some.
On the other hand, alcoholics can often navigate and carry on conversations at that lever (which doesn't mean that they are any less drunk, just better at not showing it). That's known as tolerance, and it is a prime indicator of addiction.
It means 290 parts per 100.
In today's terms 290 in Roman numerals is CCXC
290 is divisible by 1, 2, 5, 10, 29, 58, 145, and 290.
290
2% of 290 = 2% * 290 = 0.02 * 290 = 5.8
290
29 is what percent of 290? 290/29 = 10 29 is 10% of 290.
290
290 into a fraction = 290/1
70%*290 = 70/100 * 290 = 7/10 * 290 = (7*290)/10 = 2030/10 = 203
290
Half of 290 is 145.