Tristan is a salesperson who sells computers at an electronics store. He makes a base pay amount each day and then is paid a commission as a percentage of the total dollar amount the company makes from his sales that day. Let P represent Tristan’s total pay on a day on which he sells x dollars’ worth of computers. The table below has select values showing the linear relationship between x and P. Determine the percentage commission Tristan makes on his daily sales. x P 7000 165 7500 172.5 8000 180