Please fill in the last question. You get brainliest and thanks if right.

Solve for n? [tex]z = \frac{3}{4} mn[/tex]

Can some one me with these questions

One of every 20 customers reports poor customer service on your company’s customer satisfaction survey. you have just created a new process that should cut the number of poor customer service complaints in half. what percentage of customers would you expect to report poor service after this process is implemented? 1.) 5% 2.) 10% 3.) 2% 4.) 2.5%