I don't undertand how the PVA in problem 3 is normal and how the PVA in problem 4 is multiplied by 10 or something?

Compute the net present value of a $260,000 investment with a 10 -year life, annual cash inflows of $50,000 and a discount rate of 12%. Watertown Paper Corporation is considering adding another machine for the manufacture of corrugated cardboard. The machine would cost $900,000. It would have an estimated life of 6 years and no salvage value. The company estimates that annual cash inflows would increase by $400,000 and that annual cash outflows would increase by $190,000. Management has a required rate of return of 9%. Calculate the net present value on this project and discuss whether it should be accepted