(Short-selling a stock) It is 15 December 2015, and John is considering buying 100 shares of GoodLuck stock, whose stock price is currently $40 per share. On the same date, Mary is considering shorting 100 shares of GoodLuck stock. If both John and Mary intend to close out their positions on 1 April 2016, fill in the following table and graph the profits.

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A GoodLuck stock 1 price, 15 Dec 2015 2 GoodLuck stock B 40.00 3 price on 1 Apr 2016 John's profit from buying 100 shares Mary's profit from shorting 100 shares 0 34567816 123 10 20 30 40 50 10 60 11 70 12 80 13 90 14 100