I am struggling with this problem, and overall have found probability to be a very difficult subject. I was hoping someone could explain to me how to work this problem.(adsbygoogle = window.adsbygoogle || []).push({});

A stock market investor owns shares in a stock whose present value is 25. She has decided that she must sell her stock if it either goes down to 10 or up to 40. If each change of price is either up 1 point with probability .55 or down 1 point with probability .45, and the successive changes are independent, what is the probability the investor retired a winner?

Thanks

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# Stock Market investor

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