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Pre-Calculus

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A local photocopying store advertises as follows. " We charge 14 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 230, and 3 cents per copy for each copy 230 and above. " Let x be the number of copies ordered and C(x) be the cost of the job (in cents).


What would the cost be for x ≥ 230?

I really don't know how to do this...I thought the answer would be C(x) = 3x, but it's not. please help

  • Pre-Calculus - ,

    C(x) = 14 ( 150) + 6 (230-150) + 3x

  • Pre-Calculus - ,

    I solved that and got C(x) = 2580 + 3x, but apparently it's still not the right answer...

  • Pre-Calculus - ,

    actually, that's 6(229-150)

  • Pre-Calculus - ,

    So the answer is C(x)= 2574 + 3x?

  • Pre-Calculus - ,

    14x150=2100c
    230-150=80x6=480c
    3x=2100+480+3x-230
    =2580.
    Let's x be 250 copies. Therefore 250-230=20x3=60
    2580+60 =2640
    Grad=2640-2580/250-230
    =60/20=3

    Y - 2580=3(x-230)
    Y=3x+2580-690
    Y=3x+1890

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