Exercise 3 if you invest $4000 each year for 40% years, how much will you have at the end of 40 years assuming a 9% annual return?

Exercise 4 if you want to withdraw $35000 each year for 30 years, how much would you need to have saved today to fund these withdrawals? (Assume 7% annual return)

Exercise 5 if you purchase a machine and borrow $30000, what will your approximate monthly payment be if you pay back the loan over 5 years. Assume a 10% interest rate.

Exercise 6 You are considering purchasing a new machine for $32000 that will save $6000 per year for 8 years. If cost of capital is 12%, what is the net present value (NPV) of buying the new machine?