brokerage commissions

Elmo Limited’s shares are currently selling at $6 per share. For each of the following situations (ignoring brokerage commissions), calculate the gain or loss that Maureen Katz realises if she makes a 1000-share transaction.
a. She sells short and repurchases the borrowed shares at $7 per share.
b. She takes a long position and sells the shares at $7.50 per share.
c. She sells short and repurchases the borrowed shares at $4.50 per share.
d. She takes a long position and sells the shares at $6 per share.

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