You want to buy 100 shares of a stock currently trading at $50 per share. Your brokerage firm allows margin sales with a 50% opening margin and a maintenance margin of 25%. What does this mean? If you close your position with the shares at $53.50, what is your return?

Amazon.com issued an initial public offering in May 1997.
Prior to its IPO, the following information on shares outstanding was listed in the final prospectus:

In the IPO, the firm issued 3,000,000 new shares. The initial price was $18.00/share with investment bankers retaining $1.26 as fees. The final first-day closing price was$23.50.

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Percentage of Shares Outstanding After Number of Shares Beneficially Owned 9,885,000 Prior to Offering 7,5% Name and Address Offering Jeffrey P. Bezos 41.4% c/o Amazon.com, Inc. 1518 Second Avenue, 4th Floor Seattle, WA 98101 L. John Doerr 3,401,376 16.4 14.3 Kleiner Perkins Caufield & Byers 4 Embarcadero Center, Suite 3520 San Francisco, CA 94111 Tom A. Alberg Scott D. Cook Patricia Q. Stonesifer All directors and executive officers as a group (14 persons) Total shares outstanding 195,000 75,000 75,000 15,688,925 20,858,702 72.5 100.0 83.5