The Cost Function for a Certain Model of Personal Digital $C = 13.54 x + 45,740$

The cost function for a certain model of personal digital assistant (PDA) is given by $C = 13.54 x + 45,740$ ,where C is measured in dollars and x is the number of PDAs produced.Write a model for the average cost per unit produced and also find the average costs per unit when x = 180 and x = 1030.(Round your answer to two decimal places. )

A) $\bar { C } = \text { average cost } = 13.54 - \frac { 45,740 } { x }$ $C ( 180 ) = \$ 267.65$ $C ( 1030 ) = \$ 57.95$
B) $\bar { C } = \text { average cost } = 13.54 + \frac { 45,740 } { x }$ $\bar { C } ( 180 ) = \$ 57.95$ $C ( 1030 ) = \$ 267.65$
C) $\bar { C } = \text { average cost } = 45,740 - \frac { 13.54 } { x }$ $C ( 180 ) = \$ 267.65$ $C ( 1030 ) = \$ 267.65$
D) $\bar { C } = \text { average cost } = 13.54 + \frac { 45,740 } { x }$ $C ( 180 ) = \$ 267.65$ $C ( 1030 ) = \$ 57.95$
E) $\bar { C } = \text { average cost } = 45,740 + \frac { 13.54 } { x }$ $C ( 180 ) = \$ 267.65$ $C ( 1030 ) = \$ 267.65$