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Exponential growth and decay can be determined with the following equation: N = (NI)(e^kt). In this equation, "N" refers to the final population, "NI" is the starting population, "t" is the time over which the growth or decay took place and the "k" represents the growth or decay constant. If necessa

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Percentages are calculated by finding what portion a fractional amount takes up out of 100. By comparing a fractional amount to x/100, a percentage can be found.

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Percentage can be calculated on a basic calculator by multiplying with the percent button. If the percent button is not present, the percent amount can be converted to a decimal and that can be multiplied instead.

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Jari Jokinen's and the Math Easy Solutions percentage calculators both allow a user to find percentages by entering values into common percentage verbiage used in word problems. The Math Is Fun percentage calculator allows someone to compare two numbers percentage-wise.

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Calculate the percentage difference of two numbers by dividing the difference of the numbers by their average. Multiply this answer by 100 to determine the percentage difference.

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To determine a percentage, divide the actual number by the total possible number, and multiply the result by 100. For example, if four out of five doctors agree on something, enter the equation in a calculator as "4 ÷ 5 x 100." The result, 80, is the percentage.

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A calculator is always helpful when determining percentages, but you can easily compute percentages without a calculator. A pencil and paper might be helpful as you do this.

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To calculate the percentage between two numbers, determine the type of percentage needed. Then, subtract one number from the other, and divide it based on the type of percentage. Finally, multiply the answer by 100 to find the percentage.

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To calculate a percentage, simply divide one number into the other and multiply by 100. The order of division is important, and is determined by the wording of the question.

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To find a percentage increase, divide the difference between the new and old value by the old value, explains TutorVista.com. The result is then multiplied by 100 to give the percentage.