I found over 50 solutions to this question, all with the same answers, yet all showing as wrong. Could it be the NPV? I believe it is due to the need to have the answer in dollars. Can someone please try this by the directions I was given and have provided? I am totally lost now.

The Rustic Welt Company is proposing to replace its old welt-making machinery with more modern equipment. The new equipment costs $9 million (the existing equipment has zero salvage value). The attraction of the new machinery is that it is expected to cut manufacturing costs from their current level of $8 a welt to $4. However, as the following table shows, there is some uncertainty about both the future sales and the performance of the new machinery