1. Invest a single principal amount and calculate the compounded return at retirement.
2. Invest a single annual fixed principal amount and calculate the compounded return at retirement.
3. Knowing the amount of the initial single investment and the number of years to retirement, calculate the annual rate of return on the investment required to achieve the retirement goal.
4. knowing the number of years to retirement and the annual rate of return on investment, calculate the amount of fixed investment required each year to achieve the retirement goal.