Microsoft's Windows operating system continues to dominate the market, even though it has been around for over twenty years. Windows will likely remain in the maturity stage of the product life cycle___.
a. indefinitely.
b. until a superior product comes along to replace it.
c. unless Microsoft repositions Windows as an introductory stage product.
d. until it rules the world.

Your sister turned 35 today, and she is planning to save $60,000 per year for retirement, with the first deposit to be made one year from today. she will invest in a mutual fund that's expected to provide a return of 7.5% per year. she plans to retire 30 years from today, when she turns 65, and she expects to live for 25 years after retirement, to age 90. under these assumptions, how much can she spend each year after she retires? her first withdrawal will be made at the end of her first retirement year.