A company currently spends $52,500 per month on fixed costs and produces a product with a contribution margin per unit of $750. The production process involves an engraving machine that can only finish 50 units per month. The company owns one engraving machine. For each additional 50 units, another machine must be rented at a cost of $7,500 per month. The break-even point per month for this product is _____.

(I already know the answer, I just don't understand the process to find this answer Please help.)