A good business person should always have one thing very clear: the work their employees does should generate more money than it costs to employ those workers. To control it there is a program, called Money Meter.
It is a type of accountant that tells you how much each employee costs at any time; you can calculate by the second, day, week, or any other time period. Money Meter is also interesting when considering a new business project, to see if the profit will be enough, compared with the money you`ll spend on each of your employees to launch that project.
This way, with Money Meter you`ll have the cost of your employees much clearer.