calculating deductions

I need to calculate the total number of minutes an employee is late per day, and then add that total for a weekly one.

I already have it setup so when i enter their in and out time it calculates how many hours they worked. I want to use the same in and out date ( i do not want to have to enter it again), enter the weekly schedule, and get the daily and then weekly totals.

My schedules are made in excel, so i am thinking i can just copy it over, and then use some sort of formula to calculate the total number of minutes late?

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Additionally i would like excel after calculating the weekly total pull from a time deduction table, and dock their hourly wage. ie. employee normally makes $5.00. employee was late a total of 30 min for the week. (time deduction table says to doc $0.50 an hour) so for that week the employee would only make $4.50 a week.

I have looked around, and can't find too much on how to do something like that. Feedback would be really appreciated.