Respuesta :

Heather

Answer: $30 for 75 copies.

Step-by-step explanation:

    We will set up a proportion to help us solve. Let x be equal to the amount for 75 copies.

         [tex]\displaystyle \frac{10 \ copies}{\$4} = \frac{75 \ copies}{\$x}[/tex]

   Cross-multiply:

10 * x = 75 * 4

10x = 300

    Divide:

x = $30
5 copies would cost $2.

70 copies would cost $28 and adding the $2 from the 5 copies would cost a total of $30.