this question is the 2nd question in the 2019 October sat math no calculator section, I am confused arent we meant to multiply?

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Which one ? is the answer and how to find this answer

The function models the number of accidents per 50 million miles driven as a function