A proposed project for investment, with an initial cost of "costs 90, 20, 50, 30, 70, 50) 320 million (the payback period by a discount inflows is method and net 7.7 7.6 7.5 7.3 7.2 7.1 A proposed project for investment, with an initial cost of "costs 90, 20, 50, 30, 70, 50) 320 million (the payback period by a discount inflows is method and net 7.7 7.6 7.5 7.3 7.2 7.1