I think that the question is written poorly.

Question

5. Assuming a 6% interest rate, how much would Danielle have to invest now to be able to withdraw $10,000 at the end of each year for the next nine years.

I came up with $166,667 using the compound interest formula assuming that n=12, t=9.

Answer 1

it should be clear that your answer is way off, since only $90,000 is being withdrawn over the life of the investment.

So, less than $90K will have to be invested, since the money in the fund will be earning interest. Check your formula for the present value of an annuity to get the answer.

Answer 2

I got 68016.92