I make a product from lots of different raw materials, with the shipping cost getting exponentially lower with the more I order.
The same goes for the price of the materials - the more I order, the cheaper per item.
I only have a small (ish) cash flow, so I order more materials as and when I can to make my finished product.
I’m having a hard time saying ‘it costs me X to make each unit’ with each of these variables in play. Any advice on this?