Car Acosts $10 36 per 100 to drive, while car B costs 6.67 per 100 miles to drive. How much more would car A cost to drive 550 mile

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?