HELP IMA FAIL OMG I aint ever seen to pretty best friends, one always gotta be ugly

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.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.