$\backslash$table$[[$Buyer$,\backslash$table$[[$Willingness to Pay for a$],[$Baseball Game Ticket$],[($Dollars$)]]],[$Nancy$,12],[$Tom$,18],[$David$,24],[$Sasha$,30],[$Erica$,36],[$Biyu$,42]]$

Refer to Table $7-3.$ If you have $2($essentially$)$ identical tickets that you sell to the group in an auction, assuming that each person can only buy one ticket, which of the following is closest to the selling price for each ticket?

$$13$

$$31$

$$19$

$$42$