3. You decide you want to be a millionaire. You deposit $10,000 in an investment account that earns 7% per year. You also decide that you will contribute $4,500 a year to your account. How long will you have to wait until your account is worth $1,000,000? 4. At what annual interest rate must $20,000 be invested so that it will grow to be $375,000 in 20 years