Tim mows neighborhood lawns for extra money. Suppose that he would be willing to mow one lawn for $13
,
a second lawn for $17
,
and a third lawn for $24
.
Also suppose that three neighbors are interested in having their lawns mowed. Mrs. Jones would be willing to pay $30
to have her lawn mowed, Mr. Wilson would be willing to pay $26
,
and Ms. Smith would be willing to pay $24
.