show all work and variables if used please!!

Question 6 (6 points) THN Inc. just signed a sales contract with a new customer. THN will receive annual payments in the amount of $320,000, $440,000, $630,000, and $825,000 at the end of Years 1 through 4, respectively. What is this contract worth at the end of Year 4 assuming a 6% interest rate? Question 7 (6 points) Your co-worker is considering opening a retirement account with an initial $2,500 contribution. Assuming your co-worker will earn a rate of return of 8% and makes no additional contributions, what will the account be worth in 40 years when they wish to retire? How much less would the account be worth if your co-worker waits 5 years before contributing the initial investment