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260
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     1  | 
  | 
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     2  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2000, 100) == 100)
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     3  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2001, 100) == 27)
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     4  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2002, 100) == 42)
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     5  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2003, 100) == 27)
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     6  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2004, 100) == 38)
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     7  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2005, 100) == 113)
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     8  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2006, 100) == 254)
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     9  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2007, 100) == 349)
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261
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    10  | 
assert(investment(List("GOOG", "AAPL", "BIDU"), 1990 to 2017, 100) == 83061)
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