with Excel

An assembly line has problems with intermittent breakdowns. It seems that the equipment fails at some point during 15% of any eight-hour shift. Each day contains three consecutive shifts. Assuming each shift is an independent event, what is the probability that the assembly line: a) works fine throughout the three shifts on Monday? b) works fine on Monday but breaks down during the first shift on Tuesday? c) breaks down on a given day? d) breaks down during only one shift during a chosen day