To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day, but the commuter estimates he'll get stopped on about 15% of work days. I have been asked to show all of my work for the following.

During a certain 5-day work week, what is the probability that he

a) Gets stopped on Monday and then again on Tuesday?

b) Get stopped for the first time on Thursday?

c) gets stopped everyday?

d) Gets stopped at least once during the week?