题目内容

从A到B有三条公路可走，假定节假日车流密集，在某高峰时段，每条路通畅的概率分别为0.7、0.6、0.5，求该时段内：（1）从A到B完全不通的概率；（2）从A到B至少有两条路通畅的概率

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所得税费用是每年第一季度缴纳，按照税前利润（）缴纳

A. 15%
B. 20%
C. 25%
D. 30%