need help with just part b,

a. You are buying a new car that sells for $28,000. You have two options: Option one is to finance the entire cost @ 1.5 % for 5 years. The other option is to take a rebate of $2000 and finance the remainder at 6.5 % for 5 years. You are trading in a vehicle that has monthly payments of $385.94 with 2.5 years left on the loan @ 6% APR. They will give you $8000 in trade in. Which is the best deal: Option one or option 2? What will be your monthly payments

B. Use 7% rate and 30 year loan but make one additional payment a year Calculate monthly payments, total amount paid for house over life of house and years to actually pay off