Final answer:
Shania will pay a total of $1,673.49 for the drum set on the installment plan.
Step-by-step explanation:
To calculate the total amount Shania will pay for the drum set on the installment plan, we need to consider the down payment and the monthly payments.
- First, calculate the down payment by multiplying the price of the drum set by the down payment percentage: $1,455 * 0.15 = $218.25
- Next, calculate the total amount of the monthly payments by multiplying the monthly payment amount by the number of months: $80.78 * 18 = $1,455.24
- Finally, add the down payment to the total amount of the monthly payments to find the total amount Shania will pay: $218.25 + $1,455.24 = $1,673.49
Therefore, Shania will pay a total of $1,673.49 for the drum set on the installment plan.