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Question: If the price of the shares of a stock rise 20% one year and drop 20% the next year, what is the percentage change in value over those two years?
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100 > 120 > 96: price drops 4% 
Question: Alan and Brigitte are beginning a bike race. Alan begins riding at 12 miles per hour, and ten minutes later Brigitte begins riding at 15 miles per hour. How many minutes will it take her to catch up to Alan?
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Question: Let's say you buy 100 shares of a certain stock at $20 per share. The stock goes up to $22 per share, and you buy 200 more shares. The price then drops down to $15 per share, and you buy 300 more shares. Finally, the price floats back up to the $20 price, how much would you make if you sold everything at 20 per share?
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Question: Andy can swim one length of a pool in 20 seconds, Benji can swim one length in 30 seconds; if each swimmer begins at the same time, at opposite ends of the pool, moving at their normal rate, how long will it take until they meet?
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12 seconds. Reason? In one second Andy will cover 1/20 of the length, Benji 1/30 of the pool, so together they cover 50/600 or 1/12 of the length, therefore it will take 12 seconds to cover the entire pool. 
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