SOLUTION: I tried to solve myself but not sure where how to arrive at answer. Please help. The average (mean) cost for a service club to publish a directory of its members is given by the

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Question 164946: I tried to solve myself but not sure where how to arrive at answer. Please help.
The average (mean) cost for a service club to publish a directory of its members is given by the rational function
f(x)= 1.1x+700/x

where x is the number of directories printed. Find the average cost per directory for x = 500.

Found 2 solutions by Fombitz, checkley77:
Answer by Fombitz(13823) About Me  (Show Source):
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
f(x)= 1.1x+700/x
f(500)=1.1*500+700/500
f(500)=550+1.4
f(500)=$551.40 cost of each directory.