To calculate the total money earned from ticket sales, you need to know the price of the adult tickets. While you have the number of adult tickets sold (84) and the number of student tickets sold (112), as well as the price of student tickets ($5 each), without the price of adult tickets, you cannot determine the total revenue from both ticket types.
So, the missing information is the price of the adult tickets. You need that information to accurately calculate the total earnings from all ticket sales.