The business of babysitting/ nanying

Why do people chose this kind of work?
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*Adventures of Baby Sitting Movie
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1. At what age do most people start baby sitting as a job after school?
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2. How much do they get paid?
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3. What are their qualifications?
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4. Who usually takes this job?
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1900's
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1. Qualifications
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2. Pay
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3. Benefits - stock options, personal car, a cottage near the main house, paid vacations and sick time.
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4. Level of education.