Can someone please advise how to solve this problem step-by-step on a calculator? Thanks!

Option to wait. Your company is deciding whether to invest in a new machine. The new machine will increase cash flow by $435,000 per year. You believe the new technology used in the machine has a 10 year life. Obsolete 10 years from today. Machine is currently priced at 2.8 Million. Cost of machine will decline $215,000 per year until it reaches $2.155 million, where it will remain. If your required return is 9%, should you purchase the machine? If so, when should you purchase it?