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
5 answers
C(x) = 14 ( 150) + 6 (230-150) + 3x
I solved that and got C(x) = 2580 + 3x, but apparently it's still not the right answer...
actually, that's 6(229-150)
So the answer is C(x)= 2574 + 3x?
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
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
2 answers