calculate weekdays basis user selection

Thanks for the reply, i have a follow up query...will try to explain with an example.

my data has timesheet entries of employees basically each emp needs to book 8 hours every day, so if an emp has booked hours for all the days in the time range selected in the slicer then the above formula works fine. But if an emp has not booked hours for some days then it is not coming correct. e.g if there are 20 working days as per the date range selected in slicer and X resource has booked 8 hours a day for 18 days then my result should be 90% [(18*8)/(20*8)] but i am getting 100% because the above calculation is excluding 2 days as there is no entry in data