please help as soon as you can

(Comprehenslve problem) Over the past few years, Microsof founder Ball Gates' net worth has fluctuated between $20 billion and $130 billion. In early 2006 , it was about $26 billion-after he reduced his stake in Microsoft from 21 percent to around 14 percent by moving billions into his charitable foundation. Let's see what Bill Gates can do with his money in the following problems. a. Manhattan's native tribe sold Manhattan lsland to Peter Minuit for $24 in 1626 . Now, 387 years later in 2013 , Bill Gates wants to buy the island from the "current natives." How much would Bill have to pay for Manhattan if the "current natives" want a 5 percent annual return on the original $24 purchase price? b. Bill Gates decides to pass on Manhattan and instead plans to buy the cily of Seattle, Washington, for $70 billion in 10 years. How much would Ball have to invest today at 11 percent compounded annually in order to purchase Seattle in 10 years? c. Now assume Bill Gates only wants to invest half his net worth todoy, $13 billion, in order to buy Seattle for $70 billion in 10 years. What annual rate of retum would he have to eam in order to complete his purchase in 10 years? d. Instead of buying and running Iarge cities, Bill Gates is considering quitting the rigors of the business world and retiring to work on his golf game. To fund his retirement, Bill would invest his $20 billion fortune in safe investments with an expected annual rate of return of 7 percent. He also wants to make 45 equal annual withdrawals from this retirement fund beginning a year from today, runring his retirement fund to $0 at the end of 45 years. How much can his annual withdrawal be in this case? a. The amount Bill would have to pay for Manhattan if the "current natives" wanted a 5 percent annual return on the original $24 purchase price after 387 years is $3.81 billion. (Round to two decimal places.) b. The amount Bill would have to invest at 11 percent compounded annually in order to purchase Seattle for $70 billion in 10 years is $ bilion. (Round to two decimal places.)