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Private Detective/Investigator

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AVG. SALARY

$67,340

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EDUCATION

High school (GED) +

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JOB OUTLOOK

Stable

Real-Life Activities

Real-Life Math

Private investigators are called in when the facts don't add up. But they also need to make sure that the numbers add up.

Private investigator Sheila Klopper uses math when it comes to billing. "I do a detailed listing of everything I do, so the attorney and clients can see what I've been doing," she says. "I check everything before it goes into QuickBooks [an accounting program]. I use math all the time."

Last week, the police called your office. They don't have the resources to watch over a witness that they've enrolled in their witness protection program, and they've asked you to do it.

After three days, you send the police an invoice of the expenses you incurred while you guarded their witness.

Your Invoice

March 1 -- 9-hour shift

  • Drove witness to home in country: 50 miles
  • Stopped to buy witness cigarettes: $8.39
  • Called police when witness was safe at home: call took 3 minutes
  • Traded shifts with partner: 45-mile drive to office

March 2 -- 10-hour shift

  • Witness requested restaurant food: $50 and a 35-mile drive
  • Suspicious activity in front of house: call to police took 5 minutes
  • Drove back to office at the end of the shift: 45 miles

March 3 -- 10-hour shift

  • Witness was moved to hotel: 45 miles
  • Hotel fee: $150 per night, booked for 3 nights
  • Drive back to office: 5 miles

Information you'll need in order to calculate your invoice:

  • You charge 50 cents a minute for cell phone calls
  • Gas costs 65 cents a mile
  • Your hourly wage is $45