I need help understanding how to get the answers for the following questions:

You just won the $30,000,000 lottery. You will receive 10 equal payments with the first payment coming today. You can also choose the cash value. If the interest rate is 3%, then how much should the cash value be? a) $20, 350,000 b) $22, 590,000 c) $25, 590,000 d) S26, 350,000 You currently have $100,000 in your retirement account and want to retire in 20 years with $1,000,000 How much money must you deposit into your account each year if the interest rate is 8%? a) $1, 782 b) $11, 667 c) $19, 437 d) $32, 037 You just spent $800 for an asset that will pay you $100 a year from now, $300 two years from now, and $500 four years from now (You will receive nothing three years from now). What is the rate of return on this investment? a) 0% b) 2% c) 4% d) 6%