Fill in the lettered blanks in the following table: Investment A Investment B Investment C Amount of investment $180,000 (a)_ $100,000 Economic life in years 10 5 8 Annual cash inflow $20,000 (b) $10,000 Payback period in years (c) (d) Present value of future cash flows (e)__ $152,000 (f) Net present value $22,000 $12,000 ($4,000)