How to calculate Value in (%) and than create new column with percentage of used time. (Python)

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I assigned the optimal time of 960min to x.
>>> x=960.0

Then I assigned the time used 189min to y.
>>> y=189.0

Then I divide the time used(y) by the optimal time(x) and multiply the answer by 100 and assign the answer to z.
>>> z=(y/x)*100

The answer.
>>> z
19.6875

For Python to give you an accurate answer you must include decimal points.
I hope this helps.