the answers here are not correct. please show your work. thanks

John and Sally Claussen are contemplating the purchase of a hardware store from John Duggan. The Claussens anticipate that the store will generate cash flows of $86,000 per year for 20 years. At the end of 20 years, they intend to sell the store for an estimated $560,000. The Claussens will finance the investment with a variable rate mortgage. Interest rates will increase twice during the 20-year life of the mortgage. Accordingly, the Claussens' desired rate of return on this investment varies as follows: (FV of $1, PV of $1, FVA of $1, PVA of $1, FVAD of $1 and PVAD of $1) (Use appropriate factor(s) from the tables provided.) Required: What is the maximum amount the Claussens should pay John Duggan for the hardware store? (Assume that all cash flows occur at the end of the year.)