0.66 itself doesn't go on forever. If you are trying to express two thirds as a decimal, then it is 0.66 recurring. So that will go on forever.
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.66666666 (it goes on forever)
Answer: 0.6 (goes on forever)
6.6%/100 = .066
.888888888888888 it goes on forever and never ends.
7 over 6 as a decimal is 1.166666.... (6 goes on forever). Hope that helps :)