Find the Average Cost for Producing 400 Books If the Average

Multiple Choice

Find the Average cost for producing 400 books if the average function is $\mathrm { A } ( x ) = \frac { C ( x ) } { x }$ where $C ( x ) = 6.5 x + 3000$

A) $14.00
B) $66.50
C) $21.50
D) $6.50