With the small sample provided, it doesn't look as if it is repeating. The problem, however, lies in the "and so forth"; it is not clear what rule you use to write the decimal digits, and depending on what exactly that rule is, it may, or may not, be a repeating decimal. To be "repeating", and therefore a rational number, after a while the same group of digits has to repeat over and over, without end.
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no, there are no elipses so it doesn't go on forever, therefore, not a repeating decimal
No, because repeating decimals never stop repeating, so it would be impossible to have a different number that does not repeat.
0.1818
Not necessarily. Remember that the definition of an irrational number is a number that can't be expressed as a simple fraction. 2/3, for example, is rational by that definition even though its decimal form is a repeating decimal. Since irrational numbers cannot be written as fractions, they don't have fraction forms. So basically, numbers with repeating decimals are considered rational. Irrational numbers don't have repeating decimals.
Well, of course your input is 54/117. Your exact result is 6/13. The decimal approximation is just a very large decimal number. But the repeating decimal is 0.461538 repeating, so over the numbers '461538', there should be a line over them. Your percentage is 46.15%. :)