Can you explain what i am doing wrong?

My answers are:

9A: 1636.62

9B: 1767.86

My teacher says the answers are:

9A: 2271.69

9B: 2453.43

Exercise #9A: You want to withdraw $800 once year starting 3 years from now and ending 6 years from now. r=8%. How much money do you need to deposit now to fund the account fully? Answer: $....... .. .. .. Exercise #9B: You want to withdraw $800 once year starting 2 years from now and ending 5 years from now. r=8%. How much money do you need to deposit now to fund the account fully? Answer: $