Answer: 4%
Step-by-step explanation:
Given : You exercise for 30 minutes, twice each day.
i.e. Total time of exercise in a day = 

We know that 1 hour = 60 minutes.
and 24 hours makes one day.
Now, the percentage of your day is spent on exercise will be :-
[Rounded to nearest whole number.]
Hence, the approximate percentage of your day is spent on exercise = 4.17%