Using Excel. What is the present value of the following series of cash payments: $8,000 per year for four consecutive years starting one year from today, followed by annual cash payments that increase by 2% per year in perpetuity (i.e. cash payment in year 5 is $8,000*1.02, cash payment in year 6 is $8,000*1.022, etc.)? Assume the appropriate discount rate is 5%/year.