please help answer all questions, your help is very much appreciated. Thank you so much! :)

7. Maria is purchasing a van for $28,900.00. She will finance the loan for four years. The lowest interest rate that she qualifies for is 10%%. She has some savings and is trying to decide what type of down payment, if any, that she should make. 8. Maria's first inclination is to continue to save her money and finance the total loan. How much would she save if she changed her mind and put 20% down? 9. Examine the three situations covered on this worksheet. What are the three things you can do to lower your total cost when using installment credit