Maximum Credit. As of 2012, the maximum credit for dependent care expenses was $2,100 a year. However, the maximum was available only to taxpayers who had paid for care for more than one dependent, had at least $6,000 in dependent care expenses during the year, and had an adjusted gross income of $15,000 or less.A look at how the credit is calculated explains where this $2,100 figure comes from.owever, the maximum was available only to taxpayers who had paid for care for more than one dependent, had at least $6,000 in dependent care expenses during the year, and had an adjusted gross income of $15,000 or less. A look at how the credit is calculated explains where this $2,100 figure comes from.
We breathe in oxygen and some of this carbon dioxide. When we exhale, we breathe out less oxygen but more carbon dioxide than we inhale. Paul Roberts, Lake Cathie. The carbon we breathe out as carbon dioxide comes from the carbon in the food we eat. The carbohydrates, fat and proteins we consume and digest are eventually converted by a number of different biochemical pathways in the body to glucose (C6H12O6).
But the crux of the matter is the oxygen-carbon dioxide tradeoff. Your lungs just aren't as good as you think they are at oxygen exchange. Every time you take a breath, which is 21 percent oxygen, your lungs are only able to extract about a fifth of that oxygen. The rest gets breathed right back out again. There wasn't much carbon dioxide in the air you breathed in: unless you are in a failing submarine or spaceship, it's around 0.04 percent. But when you breathe out, it's still pretty low, about 4 percent. There's not a huge difference between inhaled and exhaled air, chemically speaking.