Posted by **Ann** on Monday, September 30, 2013 at 10:45pm.

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 -
**Lala**, Monday, September 30, 2013 at 10:51pm
C(x) = 14 ( 150) + 6 (230-150) + 3x

- Pre-Calculus -
**Ann**, Monday, September 30, 2013 at 11:00pm
I solved that and got C(x) = 2580 + 3x, but apparently it's still not the right answer...

- Pre-Calculus -
**Steve**, Monday, September 30, 2013 at 11:23pm
actually, that's 6(229-150)

- Pre-Calculus -
**Ann**, Monday, September 30, 2013 at 11:27pm
So the answer is C(x)= 2574 + 3x?

- Pre-Calculus -
**chipanda**, Sunday, November 15, 2015 at 3:14am
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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