Question

Using the information from the first question, which of the following represents the amount of money the store will earn from selling 70 videos? *

Answer 1

The equation for Mishra spends on buying x videos is,

$y=8x+200$

The equation for the cost of selling x videos is,

$s=12x$

The equation for earnig in the store by selling x videos is,

$\begin{gathered} P=12x-(8x+200) \\ =4x-200 \end{gathered}$

Substitute 70 for x in the equation to determine the earning from selling 70 videos.

$\begin{gathered} P=4\cdot70-200 \\ =280-200 \\ =80 \end{gathered}$

So answer is $80.