[mso] Calculating Elapsed time in Excel

I am trying to design a payroll sheet. In column B I have 
the "Clock In" time and column C I have the "Clock Out" time. 
In column D I want Excel to calculate the elapsed time in Hours 
and hundreds of hours.  Our time clocks prints the clock in and 
clock out times in time format (11:15 = 15 minutes after 11 
O'clock. 15:30 = 3:30 p.m.) 

      B         C         D
    7:00      15:30      8.0 (8.5 hrs minus .50 for lunch) 
    7:30      15:00      7.0 (7.5 hrs minus .50 for lunch)
    7:45      12:45      4.5 (5.0 hrs minus .50 for lunch)
I know Excel can do this but I have tried different formats and 
formula's I can't seem to get the right results.
I would appreciate if anybody knows what each cell needs to be 
formated as and what formula to use in column D.

Thanks in advance for your help.
Gary :-) 

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