Please show calcaltion how to solve the problems:

1. Edith plans to retire in 25 years, and she wants to withdraw $200,000 per year for 35 years. Her account earns 6 percent compounded annually. How much must she save each year to meet her retirement objective?

2. ) An investment offers payments of $100, $200, and $300, respectively, over the next three years. What is the value of this investment if you require a 10 percent return?

3. If I deposit each cash flow from the above investment ($100, $200, and $300, respectively, over the next three years,) into an account earning a compound annual interest rate of 10 percent return, how much will be in my account three years from now when I make the final deposit of $300?