Olivia bought two packs of basketball cards at $3 each, and 5 decks of baseball cards at $4 each.  If she had one $50 bill, how much change did she receive?
Two packs of basketball cards cost 2 x $3 = $<T>multiply(2, 3)=6
Five decks of baseball cards cost 5 x $4= $<T>multiply(5, 4)=20
Thus, the total cost of the cards was $6 + $20 = $<T>add(6, 20)=26
Therefore, Olivia received change of $50 - $26 = $<T>subtract(50, 26)=24
