Please help me with this???

Which one ? is the answer and how to find this answer

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%

Which of the following values are in the range of the function graphed below? check all that apply ! - will give the answer "brainliest! "