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Posted by 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 - , 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 - , 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 - , Wednesday, February 18, 2009 at 12:14am

    yes, you got it

  • Math - , Wednesday, February 18, 2009 at 12:15am

    Thanks! Take care! :)

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