Answer:
A. 104%
B. 66.7%
Explanation:
A. Calculation for what would be the percentage return earned
Percentage return =($50-$30-30*60%*7%)/30*60%
Percentage return(20-$18*.07)/18=
Percentage return=1.04*100
Percentage return=104%
Therefore what would be the percentage return earned is 104%
B. Calculation for What would have been the return if the investor had notbought the stock on margin
Percentage return=($50-$30)/$30
Percentage return=$20/$30
Percentage return=66.67 %
Percentage return=66.7% Approximately
Therefore What would have been the return if the investor had notbought the stock on margin is 66.7%