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Shares of electric vehicle manufacturer Tesla Motors Co. (Nasdaq: TSLA) slumped more than 7% after the firm reported weaker-than-expected fourth-quarter earnings after the bell yesterday. The company reported an adjusted loss of $0.13 per share on revenues of $1.1 billion. Wall Street was hoping for per-share earnings of $0.31 on revenue of $1.23 billion. The company increased its sales forecast for 2015, boosting its expected sales figure from 50,000 to 55,000.