一道统计问题（英文）
According to a survey of American households,the probability that the residents own 2 cars if annual household income is over $25,000 is 80%.Of the households surveyed,60% had incomes over $25,000 and 70% had 2 cars.The probability that theresidents of a household do not own 2 cars and have an income over $25,000 a year is_______.