Who this is for
Equipment decisions are where ROI math earns its keep. The purchase is large and irreversible, the benefits arrive over years, and the alternative, keeping cash or financing something else, has a real cost. A machine that returns 20 percent over two years may still lose to that comparison once you discount the cash flows.
Enter the full installed cost, including delivery, installation, and initial tooling, as the initial investment. Monthly revenue is the new capacity you can actually sell, or the costs the machine removes. Monthly costs cover power, consumables, maintenance, and the operator time the machine demands.