Final answer:
To calculate the total cost for a customer who rents a jet ski for 3 hours, you would add the flat fee of $24.00 to the additional fee for 3 hours of usage, which is $45.00. The total cost would be $69.00.
Step-by-step explanation:
To calculate the total cost for a customer who rents a jet ski for 3 hours, we first need to find the additional fee for 3 hours of usage. Since the hourly rate is $15.00, the additional fee for 3 hours would be 3 x $15.00 = $45.00.
Next, we add the flat fee of $24.00 to the additional fee of $45.00 to calculate the total cost. $24.00 + $45.00 = $69.00.
Therefore, the total cost for a customer who rents a jet ski for 3 hours would be $69.00.