::Then just multiply your hourly rate.::
Not always that simple. I see hourly, daily and weekly as 3 different things. Consider giving a small discount to encourage longer periods of employment if that's what you want.
Try to find out the rates on how many hours you are working a day and multiply it with how many days you are working in a week.
Sometimes it gets difficult to count the working hours. Using this method will help you get the perfect results.