It is very hard to generalize. Some things do have a historical trend. Population statistics frequently show a positive trend, hence the calculated percentages are typically positive. The downturn in the world economy recentlyproduced a lot of calculated negative percentages. You may find thousands of negative percentages if you follow the Stock Market. There is a tendency for convenience and clarity, to state percentages as "20% lower" or "20% off" instead of saying the "price today = stated price - 20% of the stated price."
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It is usually calculated on a percentage basis. A total of all your monthly obligations and your income and available assets.
In 2014, the percentage of people who were eligible to vote varied by country. It is calculated by taking the number of eligible voters divided by the total population of voting age, usually expressed as a percentage.
Radiographic sensitivity can be calculated as the ratio of the number of true positive results to the sum of true positive and false negative results, multiplied by 100 to get a percentage. This formula helps to evaluate how well a radiographic test can detect true positive cases out of all actual positive cases.
This depends on where you are. There is no Federal sales tax, but there are state and local taxes in some places. Usually it is a percentage of the purchase price.
Efficiency is calculated as output power divided by input power, usually expressed as a percentage. Power is the rate at which work is done or energy is transferred, calculated as the product of force and velocity.
excise tax
excise tax
Any percentage of temperature should be calculated in Kelvin.
The decrease in quantity is usually expressed as a percentage of the original quantity. This percentage is calculated by dividing the decrease by the original quantity and multiplying by 100. The result gives the percentage decrease relative to the original quantity.
phase is the relation to 2 or more interfering waves. It's usually given in the percentage either positive or negative interferance.
Excise tax