Respuesta :
Answer:
I'm not understanding the second part. Can you elaborate more in the comments?
But it would cost $21
Answer:
$21
Step-by-step explanation:
You have to use ratios
[tex]\frac{12}{3} =\frac{84}{x} \\\\12x=252\\x=21[/tex]
It would cost $21 to make 84 copies