Johnson Manufacturing is considering investing $80,000 in a new piece of machinery that will generate net annual cash flows of $30,000 each year for the next 7 years. The machine has a salvage value of $10,000 at the end of its 7 year useful life. Johnson's cost of capital and discount rate is 8%. Which of the following tables and criteria should we use to discount the net annual cash flow? PV of annuity table, n-1, i-8% PV of a single sum table, n-7, 1-8% PV of annuity table, n-7, 1-8% PV of a single sum table, n-1, i-8%