Posted by **Brett** on Tuesday, February 17, 2009 at 11:54pm.

Photography reprints cost $0.52 each at a local photo shop. Through the mail, they cost $0.44 each plus $1.20 postage and handling. How many reprints must a customer purchase to make it less expensive to use mail order?

- Math -
**Reiny**, Wednesday, February 18, 2009 at 12:00am
you have two functions:

cost1 = .52x

cost2 = .44x + 1.2 , where x is the number of prints

the costs are equal when

cost 1 = cost2 , or

.52x = .44x + 1.2

solving this you get x = 15

so try 16 in each equation to see which is the cheaper.

- Math -
**Brett**, Wednesday, February 18, 2009 at 12:08am
So basically the answer would be x>15? Does this make sense considering that 16 is greater than 15? Thanks for the help!

- Math -
**Reiny**, Wednesday, February 18, 2009 at 12:14am
yes, you got it

- Math -
**Brett**, Wednesday, February 18, 2009 at 12:15am
Thanks! Take care! :)

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