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www.reference.com/world-view/calculate-percentage-something-df4e7e3a5679832f

Percentage calculations come into play in many real-world situations, such as determining how much to tip in a restaurant and figuring out the discounted prices of clothing. Here's how to do these calculations.

www.reference.com/world-view/calculate-year-over-year-percent-change-10bb79f0f5d86198

An individual calculates year-over-year percentage change, or YOY change, by evaluating two or more measurements and comparing them to the same period of time in a previous year.

www.reference.com/world-view/easiest-way-calculate-percentages-93b00f9a8b7229a5

The easiest way to calculate a percentage is taking 10 percent of any number and multiplying it to find the percentage desired. To calculate 10 percent of a number, simply move the decimal point one place to the left.

www.reference.com/world-view/can-calculate-weighted-percentages-2b96671db80151e1

To calculate a weighted percentage, first multiply each item by the percentage it has been allotted, and then add those values together. Weighted percentages help in situations where certain factors are more important than others.

www.reference.com/article/percentage-figures-calculated-559414a09fae9127

Percent simply means "per 100," so any percentage number can be expressed as number/100. For example, 75 percent can be expressed as the fraction 75/100 or as the decimal fraction 0.75.

www.reference.com/article/calculate-percentages-whole-numbers-3be7ee12bccbbd3f

To determine the numeric value of a percentage of a whole number, convert the percentage into a decimal by moving the decimal point two places to the left, and multiply that by the whole number. For example, to find 50 percent of 20, multiply .50 by 20 to get 10.

An element's radioactive decay can be determined through a single equation which requires imputing the isotope's half life, its rate of decay and the decay time since the rate of decay is measured.

www.reference.com/article/regular-calculators-give-percentages-f3d33e35cc1230a1

With a regular calculator using basic math functions, it is possible to calculate percentages. To calculate percentages on a regular calculator, find the difference between the two numbers be compared, then divide that number by the original number and multiply by 100. The result is a percent increa

www.reference.com/article/calculate-population-growth-5b8ecfc4cf8308e9

Subtracting a past population value from the present population value, and dividing this result by the past population value, yields the population-growth rate. Multiplying the population-growth rate by 100 yields the growth percentage.