break even point analysis

I have simulated prices in order to calculate the PV and NPV of a project, i have a fixed price and cost for the product. With this i want to calculate the value of the cash flow so that the NPV = 0.

Below is my current code. for every month the production and cost of the product is the same, the only thing that fluctuates is the simulated price which obviosly affects the CF each month.