2.84 Calculate the annual cost for years 1 through 9 of the following series of disbursements. Use an interest rate of 10% per year. Solve using (a) factors and (b) a spreadsheet. 2.84 Calculate the annual cost for years 1 through 9 of the following series of disbursements. Use an interest rate of 10% per year. Solve using (a) factors and (b) a spreadsheet