Answer:
a. Margin requirement = 25%
Investment amount = $5000
Own investment = $5000*25% = $1250
Borrowed amount = $5000 - $1250 = $3750
Sale amount = $6000
Profit = Sale amount - Invested amount = $6000 - $5000 = $1000
Profit % = Profit/Own investment = 1000/1250 = 80%
b. Margin requirement = 50%
Investment amount = $5000
Own investment = $5000 * 50% = $2500
Borrowed amount = $5000 - 2500 = $2500
Sale amount = $6000
Profit = Sale amount - Invested amount = $6000 - $5000 = $1000
Profit % = profit/own investment = 1000/2500 = 40%
c. Margin requirement = 75%
Investment amount = $5000
Own investment = $5000*75% = $3750
Borrowed amount = $5000 - $3750 = $1250
Sale amount = $6000
Profit = Sale amount - Invested amount = $6000 - $5000 = $1000
Profit % = profit/own investment = 1000/3750 = 26.67%