Samsung Electronics' labor union is seeking 15 percent of the company's annual operating profit as performance bonuses, a demand that could total 45 trillion won ($30.3 billion) and surpass the chipmaker's entire research and development spending last year. The union raised its target from 10 percent after Samsung posted 57.2 trillion won in first-quarter operating profit on April 7, a 755 percent year-on-year surge that marked the largest quarterly profit in Korean corporate history. With domes