Why is the discount year of first problem is 2 but the second problem is 17 but not 16?

12. Your company anticipates the introduction of environmental protection laws 3 years from now. Under these laws, you will have to pay an environment tax of $5,000 at the end of each year. If the rate is 6% p.a., what is the present value of your company's obligation under this law? Suppose that you intend to retire 17 years from today. Your actuary tells you that you should live an additional 15 years after retirement. Your financial planner tells you that you will need $65,000 per year after retirement to secure your retirement goals. Your lecturer tells you that it would be reasonable to assume a 6% annualized rate of return a) What is the total amount of wealth that you will need on the day of your retirement to achieve your retirement goals? b) What lump sum of savings would you need to invest today in order to achieve your retirement goals? c) If you haven't saved anything (as of today), then how much must you save per year to achieve your retirement goals