You can get the decimal equivalent of a fraction, by dividing the numerator by the denominator. For example, to convert 1/3 to a decimal, you divide 1 by 3. This is equal to 0.333333... If you need this as a percentage, you multiply by 100; in this case, 33.3333...%
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No. 15 is a whole number. Think of fifteen apples sitting on a table. Now, .15 is a decimal fraction of one whole - it's fifteen hundredths of a percent. Think of one slender slice out of an single apple sitting on the table.
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If a fractions is 2/15 you have to find the multiples of it to make the denominator to 10, 100, 1000, and etc. so i would start from 15(denominator) 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, and a 100. so i would put the 2(numerator) in the 100th place which ithe answer is 0.02
If the table is a circle and the perimeter is 40 feet, then the diameter (rounded to 2 decimal places) would be 12.74 circumference = diameter x pi so, diameter = circumference / pi
I don't know about percentages, but since sea water has a lot of salt, I would expect that to be sodium and chlorine. (That is the common table salt; sea water also has some other salts.)