Buying Stocks With Margin And Short-selling?

Could someone please check my work?
Which of the following would offer the best return on investment? Assume that you buy $5,000 in stock in all three cases, and ignore interest and transaction costs in all your calculations.
a. Buy a stock at $80 without margin, and sell it 1 year later at $120.
b. Buy a stock at $32 with 50% margin, and sell it 1 year later at $41.
c. Buy a stock at $50 with 75% margin, and sell it 1 year later at $65.
My answers:
a. Buy at $80 and sell at $120 = 50% return on investment ($2,500 profit / $5,000 investment = 50% gain)
b. Buy at $32 with 50% margin and sell at $41 = $3,906.25 profit / $2,500 invested = 156% return
c. Buy at $50 with 75% margin and sell at $65 = $5,250 profit / $1,250 invested = 420% return
How much profit (if any) would William Anderson make if he short-sold 300 shares of stock at $75 a share and the price of the stock suddenly tumbled to $60?
My Answer:
He would profit $4,500 on the short-sale ($15 per share * 300 shares)
Given that creative systems Inc.’s stock is currently selling for $50 a share, calculate the amount of money that Alister Cooper will make (or lose) on each of the following transactions. Assume that all transactions involve 100 shares of stock, and ignore brokerage commissions.
a. He short-sells the stock and then repurchases the borrowed shares at $60.
b. He buys the stock and then sells it some time later at $60.
c. He short-sells the stock and then repurchases the borrowed shares at $35.
My Answers:
a. $1,000 loss ($50 per share * 100 shares = $5,000 invested. 100 shares * $10 loss per share = $1,000 loss)
b. $1,000 profit ($50 per share * 100 shares = $5,000 invested. 100 shares * $10 profit per share = $1,000 profit)
c. $1,500 profit ($50 per share * 100 shares = $5,000 invested. 100 shares * $15 profit per share = $1,500 profit)

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