The employees of a company were surveyed on questions regarding their educational background (college degree or no college degree) and marital status (single or married). Of the 600 employees, 400 had college degrees, 100 were single, and 60 were single college graduates. The probability that an employee of the company is single or has a college degree is ________. A: 0.10 B: 0.25 C: 0.567 D: 0.733

对乙酰氨基酚咀嚼片的含量测定:取本品10片(标示量为80mg/片),精密称定,总片重为2.6821g,研细,精密称取片粉0.1307g,置250ml量瓶中,加0.4%氢氧化钠溶液50ml溶解后,加水至刻度,摇匀,精密量取5ml,置100ml量瓶中,加0.4%氢氧化钠溶液10m1,加水至刻度,摇匀,照分光光度法,在257nm的波长处测得吸收度0.567,按对乙酰氨基酚的百分吸收系数为715计算该咀嚼片中对乙酰氨基酚含量占标示量的百分比。