Hogwarts Express LLC is a manufacturer of Train Engines. Luckily they rely on a robust quality control system for in-process product inspection and not on magic to build high quality products. As part of the manufacturing process, they inspect each batch of train engines 3 separate times. Every day they manufacturer 3 batches of engines. Each batch contains 50 engines. They operate 20 days per month. Because of this extensive quality control process, they only have 2 defects per batch. What is the Hogwarts Express Defects Per Million Opportunities (DPMO)