need help with these

1. How much is today's value of a special security, which will pay you $500 one time at the end of the fifth year and $700 one time at the end of the seventh year, if you require 10% APR return rate on the security (assume semi-annual compounding)? 2. James White just signed a $8 million 3 year contract extension with the Patriots. The contract calls for a payment of $3 million 1 year from today, $3 million 2 years from today, and $2 million 3 years from today. What is this contract really worth as of today if he can earn 7% APR on his money (assume annual compounding)? 3. The Caulkins Co. is considering a project that will produce no cash inflows (80) in year one, cash inflow of $55,000 in year two, and $72,800 in year three. What is the total present value of these cash inflows if the company assigns the project a discount rate of 10% APR? 4. How much money does Albert need to deposit into his investment account today if he wishes to withdraw $10,000 every year for the next twenty years at the end of every year? He expects to earn an average rate of return of 7% in the investment account