a. Your parents will retire in 30 years. They currently have $350,000 saved, and they think they will need $1,150,000 at retirement. What annual interest rate must they earn to reach their goal, assuming they don't save any additional funds? Round your answer to two decimal places.

b. If you deposit money today in an account that pays 5% annual interest, how long will it take to double your money? Round your answer to two decimal places. ?years

c. An investment will pay $50 at the end of each of the next 3 years, $200 at the end of Year 4, $300 at the end of Year 5, and $550 at the end of Year 6. If other investments of equal risk earn 5% annually, what is its present value? Its future value? Do not round intermediate calculations. Round your answers to the nearest cent.

Present value: $

Future value: $