EXO, Inc. manufactures circuit boards. A random sample of 500 boards is inspected every week, looking specifically for 5 opportunities for defects - missing logo, rough edge, bent board, imperfect shape, and lifted pad. During a recent week, quality inspector, Kai, found a total of 15 defects in a sample. Indicate, showing your calculations, the Defects Per Million Opportunities (DPMO) calculated from that sample.