Hi,

Try that:

Code:
Example:

You invest 20000 to start your business.


Annual costs to run your business:                50000
Annual salary: (Your salary)                      60000
Gain margin: (15% of 20000)                        3000
========================================================
Total costs:                                     113000
 

Annual work hours: (10x5 x4 x11)                   2200
Annual not billable hours (10% of 2200)           - 220         
========================================================
Total billable hours:				   1980


What you will have to charge for one hour work is:

113000 / 1980 = 57.07  (60)
Best regards,

Luciano