1. Sandra wants to deposit $100 each year for her son. If she places it in an investment account that averages a 5% annual return, what amount will be in the account in twenty years? How much will she have if the account earns 8% a year?

2. Using time To Estimate Savings. Demarcus wants to retire with $1 million in savings by the time he turns 60. He is currently 18 years old. How much will he need to save each year, assuming he can get a 10% annual return on his investments.

3. Present Value: Juan would like to give his newly born grandson a gift of $10,000 on his eighteenth birthday. Juan expects to earn an 8% annual return on his investment. How much must he deposit now to achieve his goal?

4. Future Value of Annuity: Stacey would like to have $1 million available to her at retirement. Her investments have an average annual return of 11%. If she makes contributions of $300 per month, will she reach her goal when she retires in 30 years?

Please explain in detail with math steps!