Solve the Problem $x$ Specialty Phones Is Given by the Function $f ( x ) = 15 + \frac { 3600 } { x }$

question 22

Multiple Choice

Solve the problem.
-The average cost of producing $x$ specialty phones is given by the function $f ( x ) = 15 + \frac { 3600 } { x }$ . Find the number of phones that must be produced for the average cost to be $\$ 24$ .

• A) 360 phones
• B) 40 phones
• C) 440 phones
• D) 400 phones

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