also take into account the number of men and man hours on the project...
for example: total package per man is $40/hr....you bill out at $60/hr...so theoretically, that man works 8 hrs a day, and you bill 8 hours a day...earning yourself $160 before paying overhead...
if you a one man operation, and you pay yourself as well as you would an employee, you'll lose money at this rate after paying your overhead....
if you have 10 men on site, you will earn $1600/day before overhead...you'll probably make a little money...not much more overhead here than the one man shop...assuming you don't have each man in a separate company truck...
but have 50 men on site, and now you are earning good money, $8,000 a day before overhead...
so it's all a numbers game...