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(30 + 4320*k) degrees where k is an integer.
75 is an integer, not a fraction. There is not really a sensible way of writing it as a fraction or mixed number. However, if you must, you can use (75*k)/k where k is any non-zero integer.
The answer depends on the purpose of rounding. This, in turn, depends on what is being done with the number.
You could write 97 as 97/1 although it is difficult to see any purpose in doing that.
If you have the x-th percentile, the index from a sample of size n that corresponds to it is k := max { i - natural | i <= x*n/100 }. Algorithmically, this is to sort the array and take the element k := floor(x*n/100).