Which line pictured has a slope undefined?

The sale clerk make commission of $5.39.

Step-by-step explanation:

We are given that a printer cost $49. And the commission rate is 11%.

We have to find how much commission does the sale clerk make at this commission rate.

Firstly, as we know that ;

   Commission earned  = Rate of commission Cost of printer

                                       =  11% of Cost of printer

                                       =

                                       = = $5.39

Therefore, if the commission rate is 11%, the sale clerk would make commission of $5.39.