Use the following to answer question: 
-(Figure: The Marginal Analysis of Cell Phones) Use Figure: The Marginal Analysis of Cell Phones.You are considering purchasing cell phones for your department.If you buy the fifth cell phone,your change in total profit will be equal to:
Definitions:
Referral Interview
An informational conversation with someone referred by a contact who can provide insights into a job, company, or industry.
Field Of Work
The specific sector or industry where an individual is employed or has expertise.
Day-To-Day Work
Regular, routine tasks and responsibilities that are part of an individual's daily job or life activities.
National Labour Market
The supply and demand for labor, where employers seek workers and individuals seek employment, within a country.
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