How much would you make owning your own plumbing business?

Telephone system $2,400Computers $1,000=Printer $200==Liability, compensation insurances plus truck $57,000==Van, tools, office rent, $38,000 for a decently stocked truck==Advertising $400 per month ==Business Cards, office staff or at least an answering machine figure another $2,000==Any employees? figure $45 per hr as the insurance is based on payroll=