$4200.00Not to rain on yur parade, but $4200 is not the "profit", once you subtract labor costs, general overhead, miscellaneous etc. Now that does seem like nice revenue from a one day job, but don't fool yourself into thinking that $4200 is profit.
Profit is what the business has made after all costs are taken out of the gross, not just material costs....
Labor: $96.00 8 hrs.@ $12.00
Fuel cost pick up & delivery: $5.00
My overhead is very cheap. You'd be surprised!