Answer:
$25 + $15tt
Explanation:
On a day when Mackenzie waits on 13 tables, she will earn a total of $25 in guaranteed wage plus $15 in tips for each table, for a total of $25 + (13 tables * $15/table) = $25 + $195 = $220.
If Mackenzie waits on tt tables, she will earn a total of $25 in guaranteed wage plus $15 in tips for each table, for a total of $25 + (tt tables * $15/table) = $25 + $15tt.
So, if Mackenzie waits on tt tables, she can expect to earn $25 + $15tt.