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.