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To find what percent of number y is number x, you should divide number x by number y. Then multiply your result by 100 and this will give you the percentage. Your formula should look like x/y * 100.
To find what number of x is a total of some percentage, you should divide the known percentage by 100 and multiply your result by number x. Your formula should look like y%/100 * x.

www.helpingwithmath.com/by_subject/percentages/per_calculating.htm

Instruction and guidance on how to calculate percentage values. ... The following two examples show how to calculate percentages. 1) 12 people out of a total of ...

www.wikihow.com/Calculate-Percentages

A percentage is a way to express a number as a part of a whole. To calculate a percentage, we look at the whole as equal to 100%. For example, say you have ...

www.mathsisfun.com/percentage.html

Percentages (%). When we say "Percent" we are really saying "per 100" ... percent grid 5 of 100. 5% means 5/100ths. Example: ... Example: Calculate 25% of 80 ...

www.purplemath.com/modules/percntof.htm

Demonstrates how to set up and solve 'percent of' word problems such as 'What ... If you need to find 16% of 1400, you first convert the percentage "16%" to its decimal ... In the above example, I first had to figure out what the actual tax was.

www.basic-mathematics.com/formula-for-percentage.html

Use this very straightforward formula for percentage to solve quickly any problems involving ... Study it below carefully before looking at the examples ...

math.wonderhowto.com/how-to/calculate-percentages-by-example-301940

Mar 9, 2010 ... In this tutorial the author explains of how to find percentages using examples. He explains that x percent of some number y is x multiplied by y ...

ncalculators.com/number-conversion/percentage-calculator.htm

The formula, step by step calculation & solved example problems may used to understand how to calculate the percentage of marks, interest or any relative ...

www.tutorvista.com/content/math/how-to-calculate-percentage

Percent defines how a value is related to every hundred. It expresses a number as a part of hundred. Percentage of a number is expressed as the product of 100  ...

revisionmaths.com/gcse-maths-revision/number/percentages

Percentages GCSE Maths revision section of Revision Maths, including: definitions ... Example. Find 25% of 10 (remember 'of' means 'times'). 25/100 × 10 . = 2.5.