Investors buy a studio apartment for $200,000 of this amount, they have a down payment of $40,000. Their down payment is what percent of the perfect purchase price,? What percent of the purchase price would be an $80,000 down payment be?

Three students, javier, sam, and corrine, participated in a fundraiser where people donated a certain amount of money per lap that the student ran. each student also had some initial donations that were collected before the run. the equations that represent each student's total donation, y, based on the number of laps ran, x, is shown below. match each equation with the correct rate of change for that student.