Tim mows neighborhood lawns for extra money. Suppose that he would be willing to mow one lawn for $1010, a second lawn for $1818, and a third lawn for $2020. Also suppose that three neighbors are interested in having their lawns mowed. Mrs. Jones would be willing to pay $3333 to have her lawn mowed, Mr. Wilson would be willing to pay $2828, and Ms. Smith would be willing to pay $2020.